Which company is faster Sprint or T-Mobile?

Which is faster Sprint 3G or T-Mobile 3G for the iPhone 4?

Tmoble

Sprint they don't charge for data and t mobile will slow your speed down if you go over. And Iphone uses lots of data. And you can't disconnect your background data only with android.

T-Mobile by a long shot. They offer truly unlimited 4G data with no throttling. They are now a no-contract carrier. Sprint has a slow congested network. When I had them, the fastest speeds I saw was about 900 kbps. T-Mobile i've seen 21 mbps download speeds which is 21, 000 kbps and that's on their HSPA+ network.

Don't even look at Sprint as a cell phone company. We may have unlimited data but our data speeds are dismal. The fastest speeds I have ever got were about 2Mbps and that was for just that moment. Other than that the speeds are normally around 76kbps to 400kbps. If you like to wait a very long time for something to load then get Sprint. If you would like to have DSL like speeds on your phone then go with Sprint. If you want to wait 30 minutes to download an app then get Sprint. If you don't then get anything other than them - TMobile included.