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Can use my 3G simcard on my 4G phone? Would that work?
SIM Cards
SIM cards are small chip cards that work with GSM phones to relay communications between the network and the phone itself. SIM cards are generally universal, with the exception of a few phones that use micro SIM cards — such as iPhones. However, this problem can be overcome by using a micro SIM card cutter to remove excess plastic around the edge of the SIM card. If you want to switch...