Dave Smith - 2015-12-09 08:12:42 - In reply to message 1 from Lingaraju Purushotham
The free plan comes with 250 API request per month, so as long you keep your requests under that, there is nothing stopping you from using it in production.
Aside from additional API calls, the other advantage to a premium plan is the ability to use a secure connection to keep your users phone number from being sent over the web in plain text.
You will have to decide if it is worth $10 a month or not for up to 5,000 encrypted api calls.
You need to be able to broadcast the sms to send the verification to the phone. There are a lot of services out there, and plenty of packages here on phpClasses that support them. Just do a search for sms.
I don't know if any of them provide free monthly sms, maybe somebody else has experience with the free services. All my clients use paid services.