yes it does work on verizon or sprint phones but there is one problem with the sprint phone Touch Pro2 when you switch to gsm mode there are a few screens that pop up saying ( multiple connections found settings were found, Please select one.
CHoose cancel or next.)

next screen says setting up your device to work on the network at this tie there is a hide button but if you wait it will go away but the first screen will not go away it just stays on the selection screen but it does connect to the network.
Anybody have any answers for this .
I am using T-Mobile , I have tried the ATT as well and the list that pops up on there sim card show 6 different systems T mobile shows T-Mobile or TUYO systems.