objective c - iOS:mobile sim verification code from app -

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i doing ios app having concept of sending verification code mobile no same mobile verified , give sms me. need unique id process.same kind of process using whats app , other chatting apps.

1)my problem able send message same mobile no , receiving message need unique identification number particular mobile. if place sim card in other mobile unique identification in may not collide .

as apple has stopped accessing device udid's programmatically. can use vendor id unique identifier. vendor id different same app on different device.


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