ContributionsMost RecentMost LikesSolutionsPlease help me find the signal Hello, I have a Samsung 21u mobile phone, not here before the transport signal has been good, after a period of time I found that the signal changed, My phone I can not use the sim card, this is too sad, I do not know what is the problem, can you help me unlock it? My device imei is 356544764096084. I would be very grateful.
