First, you can utilize a Phone Validator to identify the MMS/SMS email address behind a cell phone.
Next, watch the videos below to learn how to take advantage of this service and send SMS messages for FREE:
Additional Resources:
Stay Connected on a Budget: How to Send SMS Text for FreeUltimate Guide: How To Plan a FREE SMS Campaign with Phone Validator and MailChimp
What is SMS Email? Everything You Need to Know About This Hidden Feature