SMS API

which is best and cheap SMS API provider for two factor authentication ( as example when registering new user , some websites ask mobile number , then it gets 4 digit code on mobile , then it has to enter this 4 digit code on website to complete registration)
techpAsked:
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Loganathan NatarajanLAMP DeveloperCommented:
I have used Twilio as per their documentation on my dating site. Every thing we need to generate and handle with API's.  ref. http://www.twilio.com/docs/howto/sms-notifications-and-alerts
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techpAuthor Commented:
hello loganathan,

   i am talking about OTP or two factor authentication for international users in different country.....are u using twilio on your site ? what is your site name ?
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Loganathan NatarajanLAMP DeveloperCommented:
yes, we need to generate the OTP and store in db then you have to call SMS API and send it to User... while verify with user you have to just validate with db and update...
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