“Does this phone work on T-Mobile? I was wondering if the unlocked galaxy s4 would work with the T-Mobile prepaid plan. I know T-Mobile is a GSM network. On T-Mobile's website they had a list of unlocked phones you can bring to their network, but the galaxy s4 didn't show up. I don't understand why it wouldn't work though because T-Mobile is a GSM network and unlocked phones are supposed to work with GSM networks.”