I can recommend voip.ms. I've been using it for years now for the exact same wants. I have an asterix freePBX box but you can use any SIP client. SMS can be red

I can recommend voip.ms. I've been using it for years now for the exact same wants. I have an asterix freePBX box but you can use any SIP client. SMS can be redirect to your email. Affordable, reliable and works very well.