SMS Gateway .... for Rails app? (a bit OOT)

I’m simply looking for a SMS gateway… The ones like what Twitter

The intended audience would be globally.

Some of you would have used them and I’d really appreciate if you could
share your experience.

I’ve Googled and the problem isn’t that there is none, the problem is
that there are simply too many. Almost like looking for a webhosting. So
human :slight_smile: testimonials would be very helpful here.

Any resources/links/pointers will be deeply appreciated. Thank you.

Hendy I.