Valid telephone number treated as invalid.

[RokeJulianLockhart]

Please enter only numbers in the international phone number format, a leading + following by the country prefix and the phone number.
Do not use any other special chars.

My phone number conforms to this, though.

[cacilhas]

Same issue.

[RokeJulianLockhart]

Be aware of #588 (comment), per https://github.com/majn/telegram-purple#this-project-is-abandoned-see-instead-tdlib-purple.