I bought this phone 8 months ago for my daugter to use wifi for watching youtube. I bought it on ebay the guy said sim card not detecting. Just for learning purposes i thought i will dissasmble it and check the sim card try if any thing is stuck or if not i can buy a replacment part for sim reader. After dissasmbley i found that sim card reader was clean, so i temporarly assembled it and was about to order the sim reader part, just checked one final time to see if sim might work or not. I tried lebara sim card and there it was the signal was there, I dont know what fixed it a loose connection may be. I tried a few sim cards now and every sim is working. Hope this helps.