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Hard−reset your mobile device
If you have exhausted every method to fix your mobile device, there is only one more thing left to do. A hard reset is a solution to every software-related problem. It wipes down everything and it brings the device to the state it was in when it left the factory.
If you tried everything to speed up your mobile device but nothing worked, consider buying a new mobile device. If you are not sure which device to select, ask a salesperson, who will help you make the best choice according to your needs.
Note: Don't buy mobile devices from unauthorized dealers because there are many cheap copies out there.
If you decide to go out and buy a mobile device out of an authorized store, click here to read this useful article , and open the IMEI registrar, where you can enter your device's IMEI (to find out your device's IMEI dial *#06#, or look under the battery if it is removable) and check if your device is genuine or not.
If you have made too many modifications to the settings of your mobile device, you might have made it slower. In this case, a simple reset to the factory settings (without any data loss) will speed it up.