[lnichols]

So hypothetically if you were in an area with no CDMA coverage, but that had either AT&T or T-Mobile coverage, and you have the phone set to global mode, will it roam on AT&T or T-Mobile using the include SIM card (not an AT&T or T-Mobile card)? Don't know if it would ever happen that often, but was just thinking about it and thought I'd throw it out there.

[thebignewt]

No. It's gotta have an ATT or Tmob SIM to work on GSM.

[Atm0sphere]

i don't think so. you might have to do some questionable things to the device to force it to roam on a GSM network here.
overseas it defaults over, but here it's CDMA..
i know that when i turned off CDMA and turned on the GSM radio, i got no service.

[Omnifox]

If you have an unlocked Tour, and have changed out the SIM to an ATT/TMobile SIM then yes it should work. I have made calls on ATT.

(Your tour is unlocked, as your a Sprinter.)