Last week I talked about using SMS to activate your application which is a pretty powerful way to verify a user account. I left a couple of things out though. One of those things is the ability to grab the incoming SMS automatically. This is only possible on Android but it's pretty cool for the users as it saves on the pain of typing the activation text.
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A very common question we get from developers is "how do I get the devices phone number". The answer is "you can't really and you shouldn't". To clarify, this is possible on Android but would require a scary set of permissions. It's blocked on iOS completely though so you'd need a different solution anyway...
If you look at apps like Uber, whatsapp etc. they all use SMS activation. They just ask you to type your number and activate your phone via SMS. Usually this SMS is sent from the server side but for simplicity lets discuss how this can be done entirely from your app.
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