I just read the following post to this thread in my email inbox, but when I try to find it here it tells me I am 'unauthorized' to view. I assume Apple took it down, so here is another bite at the apple, so to speak from good ole cut & paste:
created by Maureenalthea in Using iPhone - View the full discussion
I too am having this issue (in addition to a sucky battery life). After a trip to the Genius Bar and feeling like my problem was my fault then an hour + long phone call to apple, My issue is finally being resolved. I did tech support for a while and have awesome troubleshooting skills. I was told by the Genius that the WIFI and Bluetooth are the same antenna and that when one doesn't work the other shouldn't. I then showed him bluetooth was fine and my WIFI still didn't work. He practically ignored my logic and said its 'generally' an antenna issue, even after I had just proven it was not.
After leaving I was furious (sorry to anyone who saw an angry shopper cussing her way to the car...) I knew this was caused by the IOS7 but obviously could not prove it. I had called apple previously (I live in the states) and had to circumnavigate their automated system by using my mac serial number (the first call prompted me to visit the store for more support). I called back (again had to circumnavigate because my phone is out of warranty). Finally my issue is being resolved by an apple customer relation specialist.
All I can say is this is Bull. We purchased a product that worked fine until the manufacturer INSISTED we update it, never disclosing the battery issues or WIFI issues (and I say insisted because Apple is very proud and loud about how many iphone users download the new updates and promise all these amazing features for FREE...insisting in my book)
The best analogy I can compare this to is a car. A car that you purchase and works perfectly fine(lots of $$$ like an iphone), and some time later provides you with a upgraded tires. Wow these tires are awesome. They make your car so fast, they perform better in all weather, and look...so flashy. And the best part is they are providing it to you for FREE. That's right Free dollars and those fancy new tires are yours.
Now you get those tires, put them on and ten miles down the road your axle breaks. Can't drive no where. but your engine still runs, but obviously the car is not working. And now the best part is the car manufacturer wants to charge you to fix it. Doesn't really seem fair right?
Its the same problem. Apple should disclose possible issues or explain these upgrades are being tested for flaws. This is a major issue, Wifi is a huge component of this phone and this needs to be fixed on their dime. If a lot of customers are having this issue, one could determine that there is a manufacturers flaw that has been exhaserbated by this upgrade.
I (polietly) told my reps on the phone that I love Apple products and in the past endorsed them fully, but I would no longer being doing that if they did not resolve my issue. I don't abuse my phone and should not have to pay for hardware malfunctions.