Iphone 4s,  wireless issues

i have recently been purchased a second hand iphone 4s and it was great, but in the past couple of days i have been having problems with my WiFi, in that it is greyed out and i cant switch it on!    i have followed the instructions on the web, ie, reset network settings, and check that phone is uptodate.  and it is still an issue!  any suggestions???

Hi Everyone,
Please refer to my post below of how i resolved my connectivity issue
https://discussions.apple.com/thread/4317427?start=585&tstart=0
In short: Netgear Prosafe WAP Wg102 : I had to downgrade firmware V5.03 to V5.01 and everything back to normal.
Netgear is aware of the connectivity issue with IOS6 and are in the process of writing a firmware for the device.
As a poster commented after my solution, these issues may not entirely be an APPLE fault, it could be firmware frmo your WiFi vendor which they sent to APPLE before they rolled out IOS6 which was buggy, hence having to "roll back" firmware.
Good Luck everyone

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    Message was edited by: michael louey

    OK, after some further experimenting, I changed the multicast rate on my airport express. It was set at 6Mbps, and I changed it to 2Mbps.
    I have read that the default multicast rate for previous 802.11g versions of Airport basestations is actually 2mbps. Excellent results so far !! I have set up a terminal command to continuously ping my airport router address every 15 sec, and there have been virtually no dropped packets so far over many hours.
    ping -i 15 10.0.1.1
    Interestingly, in Apple's Airport Admin software in my MBP there is no option to set the rate at less than 6Mbps (!!!!), so I had to use the Windows XP version of Airport admin software to make this change using a windows machine. Using the XP software you can set the muticast rate as low as 1Mbps.
    If you are using Apples airport admin software (Tiger and Leopard) and you commit any sort of change in settings, the multicast rate will be re-set at a minimum of 6Mbps. My understanding of the multicast rate is that setting it too high is similar to shrinking the coverage area of the basestation, and limiting access only to clients who can transmit at the required multicast rate.
    So my new theory is that the dropouts are caused by the MBP dropping off the airport due to not being able to achieve the set multicast rate. (this could be due to factors such as low signal strength, excessive interference or noise).
    If you are using Apples more recent Airport admin software, you are having a minimum 6mbps muticast rate set, and this might be too high for your particular environment.
    Just a theory.
    (oh yeah, I enabled interference robustness on the MBP and the basestation just for good measure)

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