GP4000A is upgraded from GP4000 for the customized requirements of dual SIM card, which not only can support 2 SIM cards at the same time, but also can switch from one SIM card to the other automatically if the current network disconnects.
GP4000A ຖືກຍົກລະດັບຈາກ GP4000 ສໍາລັບຄວາມຕ້ອງການປັບແຕ່ງຂອງ SIM card dual, ຊຶ່ງບໍ່ພຽງແຕ່ສາມາດສະຫນັບສະຫນູນ 2 SIM ບັດໃນເວລາດຽວກັນ, ແຕ່ຍັງສາມາດສະຫຼັບຈາກ SIM card ຫນຶ່ງໄປຍັງອີກອັດຕະໂນມັດຖ້າບໍ່ຕິດເຄືອຂ່າຍໃນປະຈຸບັນ.