Nowday, Is it possible to get the phone number from the device?
Is it possible to get the phone number from the device?
Recommended
I don't believe so, no.
Imagine if you could do that. Any app could grab your phone number without you knowing. It would be a privacy nightmare.
If you have a genuine requirement to have the user's phone number then you must provide a valid reason for asking them for it, and provide a means for them to enter it and send it to you, and you must ensure it is encrypted at all times and stored appropriately according to GDPR and related legislation.
If you don't have a valid reason, then don't develop an app that tries to steal it.
Hopefully, it is not possible, for the reasons @darkpaw explained.