Hi,
Not sure if this will help or not, but, try turning off Bluetooth when not 
using it. I had strange results with Wi-Fi on my iPhone a while back, and that 
fixed it.
I discovered this fix after hours and hours and hours of resetting network 
settings and restarting my phone, and also after restoring it from a Backup, 
and setting it up as new.
What was happening in my case was that download speeds were being slowed way 
down when using both Wi-Fi and Bluetooth, or having Bluetooth on and Wi-Fi on 
at the same time. This fix has worked on my iPhone, but also my brother’s.
Also, looking at ifixit.com, there are posts and reports and wiki articles and 
such on Wi-Fi issues with that particular  model of phone, so it might have to 
be repaired. I remember reading something about a screw that can sometimes come 
loose, causing Wi-Fi not to work, because it is part of the antenna structure. 
But, don’t quote me on that, I could be wrong.
I hope this helps,
Jeffrey
> On Jun 2, 2016, at 8:38 PM, Gerardo Corripio <[email protected]> wrote:
> 
> HI listers
> This is what has been happening these days with my 4S's WiFi, thus maybe ten 
> days ago), I'd loos WiFi signal, and by going to Control Pannel and 
> deactivating/activating WiFi, would do the trick of regaining my WiFi signal. 
> So that worked out OK a few days; then about last Saturday or Sunday, not 
> even the deactivating/activating tricked regained my WiFi signal! So I 
> restored Network settings to their factory default just in case, with the 
> result that the WiFi signal wouldn't be detected at all! until I powered the 
> phone off/on again, and that's how i've been working with wiFi for now, by 
> restarting the phone, but even worse off since about yesterday (even though I 
> restored the Network settings to their defaults as I explained above), the 
> act of blocking/unblocking the phone, makes my WiFi signal loos, returning to 
> 3G, having to again restart the 4S to regain my WiFi signal! What is 
> happening? Is the 4S's WiFi chip dying on me? And yes I've tried with several 
> WiFi networks with the same results; the weird thing is the WiFi signal 
> connects just great on my Dad's 3GS iPhone!, on my Victor Reader Stream and 
> other phones. So what diagnostic would you give? and is it worth fixing the 
> 4S's WiFi chip? The phone isn't originally mine, rather it was given to me 
> back in November, with WiFi working great since as I said above,about ten 
> days ago when these problems arose, thus I guess the warrantee already 
> expired since it was bought in Spain, July of 2012. Thanks for info.
> 
> -- 
> Enviado desde mi lap
> Gerardo J Corripio Flores Psicólogo, Terapéuta Reiki
> Saludos desde Tampico, Tamaulipas México
> 
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