There might be a hardware issue if the problem is not fixed yet. If the problem is not fixed yet, you should contact your wireless carrier to diagnose your number or SIM card. This might be a bit complicated procedure, thus we suggest a thorough device back-up to avoid data loss. We have a detailed post that covers this. DFU RestoreĭFU stands for Device Firmware Update. Aside from letting you update the device, the DFU mode is a well-known and trusted solution to troubleshoot stubborn issues.Įntering and exiting the DFU mode varies slightly from model to model. If not, a DFU restore might be the only solution. Once completed, the issue of the random calls will probably also vanish.
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