Will a Factory Unlocked iphone 3gs or 4s work on T-mobile?

Considering they are both factory unlocked and used with GSM carriers in my country, will they work with T-Mobile (CDMA) when i trave to US?

T-Mobile is not CDMA. Their phones run on a GSM network with SIM cards. Verizon and Spring are the only CDMA carriers. So yes, your phones will run on T-Mobile in the US if they are unlocked. If your iPhone supports HSPA+, then you can even have 4G in the United States.AT&T is GSM as well.

  • Will an unlocked iphone 4S work for tmobile if it isn't factory unlocked? I want to get an iPhone 4S and my friend has the iPhone 4 unlocked but i'm worried that if i get it non-factory unlocked it won't work. My uncle tried to do it a couple of months ago and apple said that if it was factory unlocked every time the phone shut off or died it would reset. I was just wondering if the same thing would happen if it wasn't factory unlocked? So if I get it unlocked everytime it will shut off it will reset? That is what i'm worried about.
  • Will an unlocked iPhone 3GS work with family mobile with all capabilities? My moms getting family mobile from Walmart to save money and I wanted to use an unlocked iPhone 3GS. Will it work with all capabilities?
  • Unlocked vs factory unlocked iphone? So I'm thinking about getting an iPhone but I wanted to know if I could take an unlocked iPhone to the Verizon store an them set it up for me? I have no clue what the difference between factory unlocked, unlocked, and locked iPhones are
  • Iphone 5s from T-mobile or factory unlocked iphone? I been trying to choose which iphone 5s to buy to use for metro pcs, but I ain't sure which one to get. I would get the factory unlocked but I don't if it would work with metro. Like would would I be able to use all the functions on it. Or would it be better to go with a t mobile iphone 5s? Is one better than the other? Besides being able to use any carrier on the unlocked iphone 5s.