it works fine on emulater but in real device I got this error in the log caty
zzdk: keyset not found, will generate a new one
java.io.FileNotFoundException: can’t read keyset; the pref value GenericIdpKeyset does not exist
and I have latest service-json file and I put the SHA-1 & SHA-256
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Answer
So it appears as @ikhlas ahmed confirmed the solution was
Just Make sure to send a proper phone number format to the server/api
ex: +1 555-555-5555