I have two SIMs, thus two accounts. I could not use the same e-mail address for both, so used a different address.
When logging in, my second addresss is displayed and it’s not possible to change it to the first e-mail address. So I can’t access my first account.
I find that iD is a very good provider in all respects bar one. Contact is impossible. The ‘Chat’ is too basic and thus useless.