In order to use Boost service with an ATT phone you would have to put a boost sim into an att phone, which will not work because boost mobile operates off CDMA/ODEN technology, and ATT operates off GMS/UMTS technology. Their not compatible carriers, now you could use T-mobile service with ATT; Or sprint/nextel with boost, … Read more

Boost Mobile is a prepaid cell phone company; prepaid accounts are not set up to have multiple lines on one account. Each account has one phone number that you refill every month. You can buy a new phone and set it up under your name, and have 2 boost phones in your name, but they … Read more