I got the first tier, so I can automate some text messaging with the 5000 STRs (credits) each month. I used the sim option as I didnt want the extra cost of twilio. Surprise... not only does sending messages through SMS-IT drain the STRs, but so do messages I receive on my phone and messages I SEND on my phone that AREN'T through SMS-IT. According to support, there is no option to turnoff capturing these incoming texts and there is no option to purchase more STRs. Wow. My STRs are leaking daily before my eyes, and I only sent 6 messages through this platform.