1.How to take your phone to another carrier? If you want to switch your phone carrier, but you want to keep your current phone, follow these steps: *Make sure your phone is compatible with the network you're switching to *Make sure your cell phone is unlocked *Pay off any remaining device installment fees 2.How to check your mobile is compatible with the network you're switching to? You can use the app to check whether the carrier signal is available. 3.How to check your cell phone is unlocked? If your phone is lock, you will not find any "Network Setting" entry in settings menu. You can use the app to launch the "Network Setting" menu and choose other carrier. 4.What is the "Operator Setting" app? There is a widget to find and enable the hidden "Network Setting".