Upgraded iPhone6 to ios10. cannot connect to home wifi. all other phones in house are connecting fine. have even wiped the phone to factory settings and set up as a new phone. same with router. have upgraded other phones in house to ios10, no issues. how do I fix it? it is now running my data up since it cannot connect to home wifi unless sitting next to router. can see other networks sometimes but not near as many as other phones in the house