I'll also mention CallWithUs. I used them as a SIP provider since 2007. Their interface is about the same now as it was then (A2Billing). It's no-frills, non-marketingy, works well and cheap. They accept cryptocurrency via Coinbase also. They no longer offer DIDs but recommend a separate DID provider like Virtualphoneline or DIDWW. No SMS but the DID provider might provide that.