If you need to depend of them for a specific service, don't. Go with an actual business that cares and have the focus on what's important, and more importantly a customer service that listens.
I went with a dedicated VoIP provider, and the service has been excellent
SMS is available as a FLOSS app (I use the F-Droid voip.ms app), or through another portal - able to be sent/received through email, another number, or a web interface.
I honestly have only good things to say about them (despite being a consumer of their seemingly B2B product). As a disclaimer, I don't work for them, have no affiliation with them, and made a point of not using any kind of referral link.