CODEWITHSUNDEEP
android
user1120897
user1120897

Reputation: 272

How does WhatsApp technically get the phone number?

I've got a SIM card where android itself is showing unknown as the telephone number.

Therefore also getLine1Number() returns an empty string. However, WhatsApp is able to read my telephone number perfectly.

I'm wondering how it works (technically).

Does anyone have an idea?

Upvotes: 2

Views: 5434

Answers (3)

AVEbrahimi
AVEbrahimi

Reputation: 19214

Retrieving phone number is not always possible and permitted. Most mobile operators lock this feature in their handsets.

WhatsApp ask for phone number and saves it

You can send an SMS to a server and save it, if user permits.

Upvotes: 2

Alexi Akl
Alexi Akl

Reputation: 1942

It doesn't. It's not possible for an app to get the phone number. Whatsapp asks for the number manually and it sends you a verification code by sms.

Upvotes: 2

Hartok
Hartok

Reputation: 2137

A solution would be to find the most common phone number in received SMS.

WhatsApp has the permission to do that.

Upvotes: 1

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