Differences between iphone 5s versions?

I would like to know the difference in hardware and compatibility between iphone 5s Part number: ME304LL/A (SIM FREE) and the iphone 5s Part number: ME331LL/A (T-Mobile)

i'm completely sure there's a difference since both SIM FREE and T mobile version have different availabilities, model number and different financial offers

people say its just the same phone but one has a SIM CARD and the other don't

than if that is true how come they have different part numbers or model number

also t mobile version is available to pick up in the store and starts shipping faster then the sim free version wich is not available and takes weeks to get here

also t mobile one offers special 24 month financing while sim free is not that flexible

Seems to me that sim free is a LOT HARDER to get and MORE difficult to buy just because there's no sim card?

should it be easier? I would like to know why

IPhones are a waste of money. Android is superior.

IPhones with sims are manufacturem more because there are more gsm networks than cdma globally. They are really the same phone. Ones lack of a sim card is enough to give it a different model number since techinically it is not the EXACTLY the same phone