Sorry to hear about the confusion. Yes, since it's saying it's network locked, you will need to request the phone be unlocked in order to use it with T-Mobile. I would also suggest taking a look at our Bring Your Own Device (BYOD) setup guide. It's got some important information for folks looking to use a phone from another carrier on our network.
Me too. Simple mobile say I need 12 month of service with them then they would provide unlock code but in the box doesn't say 12 month of pre-paid service. FYI Don't every buy Simple mobile pre-paid phone.