Having the exact same problem last few days. Vodafone sim, Iphone 12. Even tried upgrading to IOS 15 beta software but still same issue. Hangs on login, works no issue when on wifi. App works fine on mobile data just not browser paypal which is required for most merchnats. Tried a handfull of different browsers, cleared cookies, phone reset no luck. I have however found a work around. It appears the exact point it is hanging is at the 2 factor authenticator stage, sms page loads in the background but there is a processing circle over the top that never goes away . For me it is at least. As soon as i disabled 2 factor authentification it logs in no problem on mobile data. I re-enabled it and couldnt log in again. I also contacted paypal via app messaged and refered them to this thread. I went back to update them with this info and they had already closed my conversation... Not an ideal soloution as my account is now less secure. Regardless of fault it is in paypals interest to fix this or work out why there system either isnt working or has become incompatible with either vodafone or ios...
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