Can you take a SIM card from a Cingular phone and place it in a Cingular Go phone?

The sims are interchangeable between the gophones and the post-paid plan phones. It does not matter what sim card you have, all the phones with cingular branding are compatible with gophone, pickyourplan, or post-paid..

The gophone does not need to be unlocked. When purchased it is locked to cingular, it will still work with any OTHER cingular sim card. So you will not need to do anything, except switch the sims. It will work..

As long as the GoPhone is unlocked, you can. Actually, you can take that card and put it any ANY cell phone that is unlocked and accepts SIM cards and use your minutes on it.

I haven't tried it, yet, but my boyfriend's cousin told me that, yes, it will work. My dad's cell phone is messed up and he suggested getting a go phone and transfering the sim.