When a cell phone fails, hangs up, and refuses to work, our first impulse is to take it with us for  Mobile Repair Doorstep . But before doing it, you can do several independent actions that will facilitate professional work.  In This Article   Search for documentation  Self-diagnosis and cleaning  Storage of personal data  Update of the settings  Deactivate passwords   Search for documentation  If it's not been one year since your smartphone was purchased, your device is likely under warranty. Of course, the service is only available if you provide proof of purchase.   Please note that the guarantee only applies to damage caused by the manufacturer. If your phone has been damaged by contact with water, mechanical damage, or any other action on your part, contact  Mobile Repair Doorstep  for fast and best mobile repair.  Self-diagnosis and cleaning  Perform an initial inspection before requesting a repair. Even if that doesn't solve the problem, you will have more in...