HT204324 Wi-FI address blank in general and about on apple iphone4s.  How do I get it Back?

On apple iphone4s I can go to settings, general and then about.  Scroll down to WI-FI Address and it is blank.  There was an address there before.  WI-FI doesn't work now. What happened to it and how do I get it back?  Have tried resetting the phone.  Did not work.

Try the suggestions here to see if they resolve your problem:
http://support.apple.com/kb/ts1559
If those solutions don't work your iPhone 4s has developed a hardware problem. The permanent solution is to get it replaced.
You can search the internet for heating and freezing solutions that might work (at least for a while).
For example, see here: https://www.youtube.com/watch?v=nj10bz5bI6A
Root cause: On some iPhone 4s devices there may be a flow soldering problem with the WiFi chip. After long periods of WiFi activity such as installing an iOS update (for example, iOS 7 or iOS 8) there may be a connection failure. A work-around to this is the procedure in the youTube video.
A true hardware fix may be found here:
https://www.ifixit.com/Guide/How+to+Fix+iPhone+4S+Wi-Fi+Grayed+Out/22167

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