I am making a mobile application for Android and IOS with accounts that are linked to mobile phone numbers. I have looked into SMS authentication but it is relatively expensive for the type of app I am making. I have a textbox that asks for a phone number and I need a way to verify that the entered number is the correct phone number. Is there any alternative ways to verify a mobile phone number?
Is there any alternative ways to verify a mobile phone number?
There are ways to verify that a phone number is valid, but in your case you also want to verify that the phone number belongs to the user. There's no way to verify that without sending some sort of confirmation code via text or call, and having your user confirm that code in your application.