Google Voice SMS
Simplisafe -- just like my banks -- should support sending text messages regardless of carrier. It's ridiculous that SMS needs to be tied to a specific carrier. I need security monitoring because I'm frequently overseas for extended periods. So of course I use a local (non-US) cell provider/SIM card when I'm there. I'm not going to turn on international roaming for my US cell phone for such an extended period just for Simplisafe. Google Voice allows me to use my US number while overseas, and Simplisafe is the ONLY vendor/company I use that forces selection of a US carrier just to send an SMS message. It's going to force me to change to another company.