1) Yes, it can be done. It makes no difference that the lines are with different carriers. It'd be better to have both lines in the same account, so the rep can view just that account and sees both phones. If you need help putting both lines in the same account, let us know.
2a) You need to use Chat or call, you can't do it yourself. Use Chat, so all the phone numbers and balances are written down, reduces mistakes.
2b) See THIS THREAD for sample script of the process.
Lately, some reps didn't want to give out account balances. You can turn that around by asking "My phone (xxx) xxx-xxxx has xxx minutes/xxx texts/xxx GB, can you confirm that for me?".
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