I let a friend borrow my nokia phone because I acquired a galaxys5 that has since been stolen.so I had this nokia phone activated and I cant figure out how to reset the phone or just really delete his accts google,microsoft,off my phone.also the contacts,do I have to delete every single one,one by one or what?he didn't return the manual so im having a helluva time figuring this thing out again.any help would b great!