Can I keep my cell phone number if I switch to iPhone?

I have a blackberry right now and desperatly need a better phone, so I'm planning on getting the iPhone 5. But… I'm planning to get an unlocked one straight from apple, to from any providers, does that mean that I will lose "my" current number? I'm on t-mobile right now btw. And if I put my iPhone on tmobile will I have the same number?

It all depends on the retailer, but most companies allow you to keep the number for around a fee usually from $25 to $50 for one time.

Yes, you can transfer numbers on to any new SIM card you receive. Simply by visiting the providers site or giving them a call.

Yes, you can transfer the number to your new iphone. I did this and so did my dad.

Yes, You will have the same number. You can use any number Sim card in an Unlocked handset.