Thank you for sent. Are there any instructions on how to install this operating system on my phone?

Description of problems: The phone makes a noise during a call. We have tried calls to more than 10 different phones and they hear noise everywhere in the handset. Reconciliation is almost impossible.  - whoever I call they hear me very badly and with a loud noise - I reset the phone to factory set...

Description of problems: The phone makes a noise during a call. We have tried calls to more than 10 different phones and they hear noise everywhere in the handset. Reconciliation is almost impossible.  - whoever I call they hear me very badly and with a loud noise - I reset the phone to factory set...