GAS app - can’t create account & receive confirmation code…

so when I'm trying to create an account in this new Wireless app I can't receive my phone number confirmation code so I'm entering legit phone number but then I just see this sorry we only allow mobile phone numbers and that's it that's the error like do you have the same error or something maybe it's just because I entered non-us phone number uh so maybe that's the issue but it still allows to enter that so then it should work otherwise it just wouldn't accept non-us phone numbers so what do you think guys that's just my observation if you have any clues about it just leave some comments maybe there are servers just overloaded or something like that