New Windows Phone User. Swap Prepaid SIM to Unlocked Phone

[oneninertb]

I wanted to try Windows Phone so I got a prepaid 635 from AT&T. I really like the phone and the OS and I would like to get a better phone but stick with a no contract phone. If I get an unlocked higher end Nokia/Windows Phone, as long as SIM card is the same type, can I swap from the 635?

With an unlocked phone, where do the OS updates come from? MS or the provider of service?

Thanks

 

[xandros9]

Yes.

You can even cut down the SIM to nano-SIM size if you need to, although YMMV.

OS updates for unlocked, unbranded phones comes direct from MS.

 

[mary beth hale]

Been using unlocked,unbranded phones for a few years now and switching sim cards works fine. I currently have a 930 and a backup 635. Nano sim and micro sim. I just use a sim adaptor. It's a bit nerve wracking the first time using the sim cutter though. :/ It's nice not depending on a carrier for updates.
Edit: Be aware there is a difference between unlocked and unbranded. For ex: An "unlocked" AT&T phone,even if used on another carrier, will still get updates thru AT&T. "Unbranded" are usually international models. You may not get stuff like LTE. Have to check which bands are supported.