[Q] Unlock sim roaming

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Hey so does anybody know if there is a way to unlock the sim card or what ever is keeping the phone from using ATT bands for data roaming here in the states. Can unlocking the sim slot be used for this purpose or will a root or custom rom and or kernel be needed to acquire this?

Pretty sure you're gonna have to flash a custom radio for this.

The sim is unlocked, the GSM radio software forces the phone to ignore US based towers.

I'm willing to bet even if you use a custom radio that you'll end up paying roaming charges if you go onto AT&T. If they wont give their own customers unlimited data, they sure as hell won't give it us. I'm far more interested in forcing my phone to roam on verizon's towers.

Originally Posted by sub2k1

I'm willing to bet even if you use a custom radio that you'll end up paying roaming charges if you go onto AT&T. If they wont give their own customers unlimited data, they sure as hell won't give it us. I'm far more interested in forcing my phone to roam on verizon's towers.

Even if the phone is SIM unlocked for North American carriers, I don't think it will be possible to roam on AT&T without an AT&T SIM. In other words, the SIM that came with the Photon won't work here in the US because AFAIK Sprint does not have any GSM roaming agreements in place. Sprint roams off of CDMA carriers like Verizon, Alltel, US Cellular etc.... If you can get rooted, maybe you can get Mr Greg's Roam Control app to work. That would allow you to force roaming on Verizon and you would not need to worry about SIM unlocking because that type of roaming doesn't use the SIM

Someone in another thread said that they roamed on GSM in the states. I think the thread is in the general section.

Originally Posted by reddragon72

Someone in another thread said that they roamed on GSM in the states. I think the thread is in the general section.

They lied...

I'm not worried about roaming charges I work at sprint and get my plan free but if I were to put a ATT sim card in the photon and could use ATT I would have to have a ATT plan correct. Sorry this might seam silly questions but I really have no idea how sim cards work. Also has any one gotten the roam control app to work it worked great on my old epic to roam on verizon?

Originally Posted by abrcrmdl23

I'm not worried about roaming charges I work at sprint and get my plan free but if I were to put a ATT sim card in the photon and could use ATT I would have to have a ATT plan correct. Sorry this might seam silly questions but I really have no idea how sim cards work. Also has any one gotten the roam control app to work it worked great on my old epic to roam on verizon?

Yes if you put a Att sim in the phone that is attached to an active account it will need a $15 200mb smart phone data plan or higher to work for the internet if you disable data and use the sim without a data plan and you'll avoid the pay per use data charges if you have a messaging phone attached to the sim before hand with unlimited data and put it in the phone internet wont work, if it dose I'd check the plan attached to the sim card. You can do this by pressing *3282# or *data#