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Last Updated: Tue, Apr 4, 2023

Mass texting for alerts, reminders & updates

Your important time-sensitive messages can now be read with 'one-to-many' mass texting almost instantly by all your customers, employees or members fast.

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Show Them Who's Texting

Your texts will be sent from your dedicated local or toll free Sigma Voice 10 digit phone number.

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Phone Number

When you send a text message it will be sent from a long code. A short code is a 5 to 6 digit number and a long code is simply a 10 digit phone number with texting capabilities. In addition to texting, it can be used for call tracking as well.

In your account, you can add more than 1 long code phone number if needed. This is especially useful for organizations with multiple locations. A few examples are a religious institution, medical office or retail stores with more than 1 location. For example, if you're using Sigma Voice to mass texting to employees make sure to email your employees the Sigma Voice phone number.

One additional point to remember is that some percentage of your contacts will reply or text back to your Sigma Voice long code phone number. These replies will be displayed in your account and you can reply to those replies and continue the texting conversation. It's important for your team to be aware of that so they are prepared to receive answer any questions or provide any additional information as needed.

If the text broadcast message was about booking an appointment, the inbound team should be prepared to book an appointment for the customer.

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Your Time To Speak Up

Your texts can be personalized, include emojis 😊 and images 🖼️. Receive replies and reply to replies and so on.

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Text Messsages

During and after your text broadcast, some percentage of your customers want to reply to your messsage and they can too.

No need to worry about keywords either.

They'll just reply like normal.

Those replies are available to view and you can reply to them right inside your Sigma Voice account.

It's a great way to keep the conversation going.

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Upload & Manage Your Contacts

Quickly import your contacts into your account. Duplicate phone numbers will be removed.

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There are 2 ways to add your list of mobile phone numbers into the Sigma Voice system.

If you have a small phone list or want to create a testing phone list, you can enter the mobile phone number of each contact manually.

For larger phone lists, there is an upload option. All the popular file formats can be used like Excel or even Notepad.

In addition to the cell phone number, you can add the contact's first name and/or last name as well.

After the group is created, it's easy to add new contacts, edit existing contacts or even delete existing contacts. In the event you want to delete a contact, we recommend adding the contact's mobile phone number to the Text Block List in order to prevent this phone number from being texted again.

In your account, you can upload many lists of cell phone numbers. This makes it easy to text or sms a segmented phone list as needed. For example, a home services company may want to text message 10,000 customers over the course of 10 days. So the 10,000 contacts can be split into 10 groups of 1,000 mobile phone numbers each.

Long codes phone numbers have a maximum limit of 3,000 text messages per day to stay compliant. Short codes can send up to 1 million or more text messages per day.

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It's Easy To Honor Remove Requests

Easily add phone numbers to your block list. Before every text broadcast, do not text requests are removed everytime.

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Text Block List

In order to stay compliant with the applicable laws and honor your contact's preferences, Sigma Voice offers a master do no text list for your convenience.

Any phone number added to your text block list will be automatically "scrubbed" from your phone lists prior to sending the text broadcast.

This is considered a best practice in the bulk messaging industry.

Note: It's not enough to simply remove a phone number from your contact list. Invariably, a new contact phone list will be uploaded with one or more phone numbers that were previously removed. As a result, those phone numbers will be called again unless those phone numbers are also in your text block list.

We also suggest downloading your text block list from time to time for backup purposes.

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Send Out Your Texts

Your texts can be sent right away or scheduled for a future date & time. 100 texts can be sent within 10 minutes or less.

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Text Broadcast

There are a few important settings to consider when setting up the text broadcast.

The first is the date and time. By default, the text broadcast will be sent immediately during the window between 9am and 9pm. Alternatively, your text broadcast can be scheduled at a later date or time. It's up to you. For example, tomorrow from 1pm to 4pm.

Next, you'll select the short code or long code you want to use.

In general, the system can send 50 text messages per minute or about 3,000 per hour with a long code.

It's important to remember that most if not all of your customers will see and open your text message unlike much lower b2b email open rates.

A short code has greater speed and sending capacity.

Next, you'll select 1 or more groups you want to call. Our system automatically checks for and removes any duplicate phone numbers across your groups. Also, your groups are scrubbed again your call block list everytime as well.

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Real-Time Reporting

In addition to real-time reporting, a PDF report that shows the result of each text message.

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Text Reports

The Text Reports show a summary of how many contacts were sent and failed.

At any time during the text broadcast, it can be stopped and restarted.

Lastly, there is a CSV and PDF detailed text report that shows the result of each text to your contacts.

The call report is automatically emailed to the admin contacts of your Sigma Voice account at the completion of the sms broadcast.

Date First Last Phone Disposition
11:00am John Doe (NXX) NXX-XXXX Delivered
11:00am Mary Moe (NXX) NXX-XXXX Delivered
11:01am July Dooley (NXX) NXX-XXXX Delivered

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The Sigma Voice Difference

Here's what makes Sigma Voice the smarter choice.

Easy To Use

Setting up a call or text broadcast is so easy that you'll feel like a pro within just a few minutes.

Super Fast Delivery

Just sit back and watch as your calls and texts are sent out very quickly to all your contacts.

Real-Time Reports

You'll see the summary report as well as a detailed report that shows who got what & when.

Friendly Customer Support

We're happy to help anyway we can day or night even on weekends and holidays.

Competitive Pricing

Sigma Voice offers several low cost pricing options for mass calling and texting. Choose 'Pay As You Go' for only 6 cents per message or get an even lower rate with a monthly package.

Tons of features are included free like answering machine detection, real-time reporting, scheduling broadcasts, automatic opt-out, text to speech and more.

Also, knowlegable & friendly phone, email and chat support are included.

Learn more about Pricing

Industry Specific Solutions

Sigma Voice helps several industries like home services, senior living, recruiting & staffing and associations & unions generate more revenue from their existing relationships.

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Home Services

Generate More Revenue From Existing Customers

Sigma Voice is an excellent customer retention strategy for home services companies that offer carpet cleaning, hvac, pest control and plumbing services. It's very costly to acquire new customers, so it makes sense to keep the ones you've already earned. Email newsletter open rates are only about 25%. So the other 75% of your customers may be scrolling past your email specials for service. A Sigma Voice voice broadcasting press 1 campaign to book appointments can generate a 400% ROI for your business.

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Senior Living

Increase Census & Decrease Employee Churn

Senior living companies like nursing homes and assisted living facilities use Sigma Voice mass texting important informational updates to family members and staff members. Ongoing communication with families can help stabilize and increase census. In addition, employee communication from executive directors and other company leaders can decrease employee turnover.

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Recruiting & Staffing

Win More Job Placements

Sigma Voice is the perfect solution to use when a client needs several positions filled by tomorrow. Simply record your message and send your mass calling campaign to all your qualified candidates within a few minutes to see who is available. Staffing and recruiting companies use automated calling and mass texting to fill job orders, confirm candidate availability, update contact lists, inform candidates about important updates and send reminders to submit timesheets.

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Increase Donations & Volunteering

Nonprofits like Churches and schools can quickly and easily contact donors and volunteers with our easy to use phone tree system to increase donations and engagement. Better communication means more informed members which can increase attendance at events, fundraisers and volunteer opportunities. It's easy to send important announcements, welcome new members, keep members informed, send emergency alerts and gather feedback with a phone survey.


Some frequently asked questions.

Yes! Sigma Voice offers a free trial of the calling service only. In order to qualify, please register using a company email address like

You can call 1,000 contacts for about $50 in about 10 minutes. That's about 100 calls per minute! This example is based on a 30-second voice recording, which is an average recording length for an automated phone call. This is based on 10 cents per minute.

Automated outbound calling is a technology that delivers a pre-recorded to the phone numbers of an organization's contacts. It's much faster than manually dialing phone numbers 1 at a time.

  1. Set your Caller ID phone number
  2. Call to record your message
  3. Upload your contacts
  4. Schedule the calls to be sent

Your recording can be as long as you want. Usually, they're about 24 to 30 seconds. Be sure to record in a quiet room to make sure the recording is as clear as possible.

Sigma Voice accepts many popular formats like Microsoft Excel, CSV and TXT. Each phone number should consist of 10 digits.

Canada and US phones all use one single format: (NXX) NXX-XXXX, where N is 2–9 and X is 0–9. 

Parentheses, dashes and periods or ok. Also, duplicate phone numbers will be automatically removed.

Sigma Voice accepts multiple forms of payment exclusively through PayPal.

We're Seeing Stars

Ken Doke profile picture Verified Customer

Ken Doke

Nonprofit Organization

I have been using Sigma Voice for a few years now on a number of campaigns. They have always been reliable and competitive. Their customer service is phenomenal. I highly recommend.

Mark Hamilton profile picture Verified Customer

Mark Hamilton

Nonprofit Organization

Sigma Voice exceeded our expectations for our call out needs. When we needed changes made they were happy to do so and performed changes in a timely manner. I highly recommend Sigma Voice.

Emma Otto profile picture Verified Customer

Emma Otto

Retail Store

We have used SigmaVoice for our business for a few years now, and it has been a very good experience. The website is simple, straightforward, and easy to navigate. Customer service is excellent; professional and prompt.

Kristin Taylor profile picture Verified Customer

Kristin Taylor

Senior Living

Sigma Voice was so easy to set up. I needed to get an immediate message out to my 60+ family members. It’s affordable, the reports are amazing, and the customer service is beyond what I expected on a Sunday afternoon. Highly recommended!

Haith Johnson profile picture Verified Customer

Haith Johnson

Retail Store

Absolutely LOVE THIS SERVICE!!! I recommend using Sigma Voice for any growing business!! We have got great responds & is a good way to stay in touch with your customers base! Helps us to turn customers to Loyal Customers to VIP Customers!!!

Pedro Hernandez profile picture Verified Customer

Pedro Hernandez

Medical Offices

This service is fantastic. Setting up automated calls is super easy and affordable. I highly recommend it.

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Check out the Sigma Voice blog to learn about mass calling and texting best practices.



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