Great app & Great customer support!!
I used google voice for years, and it started to not work as seamlessly as it used to. I scoured the App Store to find a company that allows porting existing phone numbers into it; Sideline/Pinger is the way to go. Customer support is impeccable and they helped with getting my number ported from Google voice over. Google charges $3 for porting numbers, which sideline will not pay(but its $3) to keep the same number.
Highly recommend downloading this app, and do not write bad reviews if the app doesnt work properly. Email customer support first and they will help with the problem. A++
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Sideline: 2nd Phone Number App, v2.7