Two Factor authentication for Multiple Accounts



I have for every personal spoken language different accounts. I see a lot of intrusion alerts into my account, with temp. password requests.

Enabling 2 factor auth is not working for me. My mobile carrier does not allow premium services to stop or start anything mobile auth related. Also enabling 2 factor auth with the twitter app is disabled in all my accounts, even they are mapped with the accounts.

Question: Is it possible to change the 2 factor auth for using with multiple accounts per single number or single app? What are the plans for the future to security measurements regarding accessing twitter?