Cheapest way to send SMS for number verification? [closed]

Answer 1

You're looking for a bulk SMS provider that can send internationally. A web search for "bulk sms" will show tons, including some I have experience with: clickatel, mblox, clx. The simplest way to interact with such services is via HTTP by POSTing your submissions to their gateway.

Answer 2

Twilio is the best, fastest, cheapest and has a TON of amazing features you may choose to use in the future

http://www.twilio.com/

Answer 3

It's fairly easy to send SMS via email as well. The downside is that you need to ask the end user what country and carrier they have.

Answer 4

You could prefer to use Zeep Mobile API. It is free for development and bulk message. Only due to sponsorships, it inserts ads into your messages.

Still it is a good one and worth a try.

http://www.zeepmobile.com/

Best of Luck!