Hey All!
Ok..... Ive had my iphone 6 128gb for about a year to date and over the last month or two my wifi and bluetooth has not worked properly. Most of the time and every now and again ill get one bar of wifi for a few minutes then gone. I have a greyed out wifi switch that wont move and every time i try with the short cut wifi button it goes blue then grey.
I tried all of the above, reset network settings, backup reset and restore phone etc etc. Spoke with apple tech but Nothing seemed to work.
So iv decided iv had enough and im going to sell it. so story goes like this......i want to factory reset the phone before i sell. I look at the apple page and it instructs me that before giving your apple product away you need to log out of icloud/apple acount before reset "for safe security and all that". Once done you can factory reset.
I then do as it says and log out of my icloud/apple id account.
LO AND BEHOLD WIFI/BLUETOOTH back in full effect!!!!
Another bit of apple trickery hidden in the updates to get you to purchase a new phone.
Not once when i spoke to and apple tech did they mention/suggest this might be the problem all i was told is that if all the reset stuff does not work it might need new wifi hardware ££££££ "or how about a new iphone 8 or X. Funny guys you cant hate there marketing strategy
Anyway this worked for me and hopefully it might be the answer for others obviously the other issue now is not being logged in to your apple account where all your personal stuff resides.