SOURCE: alias sch u740 bad reception
hey, make sure that the simcard that you are using is supported by your celphone, the one that they called openline means all networks or simcards can be use with it.
SOURCE: how to fix my NAM on my samsung sch 700 cell phone
OMG my phone is doing that too.... i believe that you can take it to your Cell phone service provider and have them unlock it for you. to do this you must go to a technician. the problem that happened was that i knocked my phone off the network so basically its usless at this point so i will need a new phone unless they find out the code so if they cant fix it your going to have to get a new phone
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