CheckMobi - Cheap phone verification with sms or call ID
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Hunter
SMS verification
Caller ID => You call a number that does not answer the phone but verify your number (can be done automatically with Android)
Reverse caller ID => A number call you (for not even a second so you don't answer) and you have to under the 4 last digits of the caller number to verify yours
The cost for one number verification is about 0.015 cent which is drastically cheaper than anything else.
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