I own https://callplicity.com. You can easily setup the phone system through the website and then make/receive calls through the app. Please let me know if this would work for you. Thanks. Source: about 1 year ago

I own callplicity.com and you could port your number over to us. We would be happy to have you :) Our plans start at less than $10 per month. You could then use our app to make and receive calls and text messages using your USA phone number from the UK. Please let me know if you are interested. Thanks. Source: about 1 year ago

After a TON of work. I launched callplicity.com a couple of months ago. If you use my service you can deal directly with me :). I'd be happy to have you. The billing model is all based on actual usage instead of users and features. So I probably could save you some $ too. Source: over 1 year ago

Also, an alternative would be Textable. We offer plans starting at $5/mo that provides a user interface both on web and mobile for utilizing their API with your existing numbers. You can see more details at https://textable.co (Disclaimer: I work here). Source: about 1 year ago

I can’t offer much on the 3CX side as they’ve alienated us out of being customers, but, if you’re looking for a more robust messaging solution, you can check out our app, Textable. (https://textable.co) disclaimer: I work here. Source: about 1 year ago

Hey, check out https://textable.co (I work there). It sits alongside your voice product and uses your own carrier connection and has more advanced messaging features than 3CX (and most other PBX). I think our "Blasts" feature is what you're looking for. Source: about 1 year ago

Sure, I thought that would link but it doesn't seem to be. https://textable.co we've got plans starting at $5/mo for the most "basic" messaging. It comes with some extra features like away messages and canned responses. There's a $30/mo plan that has a bunch of marketing features (meant for business). Source: about 1 year ago