Can you not "just" pay a subscription for a VoIP/SIP phone number and then use a compatible app on your phone? There are several providers you can just pay a per-number monthly fee and will handle calls and texts.
Re:Cophone – Your Virtual Smartphone
by gregsadetsky on Friday July 28, 2023 @12:15PM
(#36909120)
That might have been the easiest i.e. transferring my numbers to voip.ms (instead of Twilio) and then not have to do the forwarding at all.
I'm a bit locked in for now (and am dreading transferring all the numbers I've accumulated) but yeah. Thanks for the perspective
https://www.twilio.com/labs/twimlets
I use the "Forward" one for calls.
For SMS, it used to be not too complicated - I would host a file directly on Twilio (using a Twilio bin) to forward the SMS to another number.
Recently, sending out SMS's has become a lot more complicated due to compliance (Twilio wants to make sure you don't spam people - but the burden on small developers was just too much for me, after ~2-3 months of back and forth emailing with them to get approved)
I've switched my SMS forwarding to use https://pushover.net/ . I use Twilio's hosted nodejs platform to get the incoming SMS message, and use Pushover's API.
It's potentially brittle-ish overall (lots of pieces) but it's also been working for years.
A native mobile app that would let me just get calls and sms for my hosted Twilio phone numbers is really what I'm asking for... :-)