I have an LG G3 - unblocked, purchased last summer - currently on Verizon month-to-month. Can I switch to T-Mobile? The phone would not read the T-mobile SIM card at their store. I get that. It's because of the VZW software on it now, right? So, would I have to reset the phone to the factory software? I'm not sure I want to go through all that, then re-install all the apps. Just considering my options. Thanks.