I have been a user of Line2 for multiple years but service quality has steadily declined so I am looking for a cheap alternative.

I spend most of my time outside the US and have been keeping my US phone number active primarily for banking. I just need an app that reliably can handle US calls and SMS for my legacy phone number, nothing more. Very low usage.

Now that my number is no longer with a carrier, some options (like Google Voice) are unavailable for direct porting. Porting to a mobile carrier and then back (which some do) makes me nervous something can go wrong given I have no way to test it with the carrier. I prefer to switch to another VOIP provider in one step. Suggestions?