I have an n900p running 4.4.2 with mj4 modem. Philzs recovery. And rooted. Did a full wipe fresh install of nab downgraded modem to mi3 and mj4. ##786# ,##72786#. Followed sim unlock proceedures for domestic sim unlock, edited the build.prop. used gt tools for sim unlock internationally. Deleted all apns, added the new apn for the ultra mobile. (Tested sim and apn on n900v all working so I know sim is acttive and working) I just get red x for signal. The imei says clean on swappa phone was working on sprint a few days ago and was removed off account so it should be free and not blacklisted. And *#0011# pass. When I search for networks phone is still finding sprint but the sprint card is out of phone. Has anyone has successfully got rid of the red x problem?