[Q] Roaming Network Problem

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http://forum.xda-developers.com – Hi, i have Motorola Photon rooted and unlocked, i live on the border with Mex also i have this phone with a Mexican Telcel SIM Card, works perfect on Mex, but when i back to USA i lost the Mex network and the phone start to search for networks and i just see Sprint network, but i can't receive or made phone calls on sprint network roaming, if i remove the sim card and put the sim on my HTC i can see more networks, sprint, AT&T, verizon, etc and i can go in to roaming and works perfect, i can made and receive calls on roaming, but if i back the sim to the Photon i just find a sprint net (HowTos)