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Not exactly a PHP quesiton per say, but wondering how it is done.
on some sites, to verify your user account, they will send you a Text message to your mobile that you have to enter to verify your account.
How is this done? What kind of mobile service provides this feature? expensive?
Generate some random security pin and send the sms the user then enters the pin and you can authenticate
it gets a little more complicated if you want to do a MO (mobile origionated) authentiaction you need to capture - took me a couple of days to get our incoming sms handeler working.