[nexoft]

The issue I noticed is I still could make calls from and to local numbers (+33 to +33) but not from/to foreign numbers (+33 to +else)

[lxgr]

That's odd – I wouldn't expect WhatsApp to use the phone number for any internal routing-related decisions (or as anything other than an account identifier in general). If it's a routing issue, that could explain the problems being localized, but I wouldn't expect the actual account phone number to have any bearing on it.

I've had no issues using it all day across several countries for both calls and texts.