IPhone 4 isn't recognising sim?

I got this iPhone 4 yesterday and the tmobile SIM card isn't working it just says no service help me please thank you

Is the iPhone unlocked? That sounds like the network can't connect to the SIM card. You may need a new SIM card, or to unlock the device

Tmobile doesn't have the iphone. You woud need a factory or att unlocked iphone to use on tmobile.

Is the T-Mobile SIM activated? Perhaps a stupid question, but best to start with the simplest thing.

Is the iPhone you purchased either factory unlocked or an AT&T iPhone which has been unlocked? If not, it will not work with T-Mobile.

I purchased an unlocked iPhone from the Apple store last week and then stopped by T-Mobile on the way home. They activated my account on a new SIM (it uses a tiny SIM and my other phone used a much larger one) and by the time I left the store it was working.

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