If you're not happy with your cell phone, you can switch your SIM card to another phone and keep the same Boost mobile number.
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Turn off the Boost mobile phone you no longer wish to use. Remove the back of the phone and the battery.
Remove the SIM card from your phone.
Remove the back and the battery from the new phone. Make sure it's turned off first.
Place your SIM card into your new phone and turn it on. Your new phone is now on the Boost mobile network.