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I bought second hand iphone 11 from sharjah UAE. Buying time I put sim card & chek about the network status. That time its work perfectly. But I came to the my home place I found there is a network issue it means signal was thare but I cannot make calles. I tried same sim card with my other iphone its work smoothly in same place. Meantime i reset my netwok settings & tried again. after that its workng but after one two days same problem came. is it any hardware foulte or software? please give me guidlines for solve this matter. If any solution please let me know.