TS1559 I believe it my have something to do with my modem firmware , I have a iphone 4 and no problems but i changed the sim card in my 4s and the firmware seems to be an older version could that be a problem

I have a 4-s and a 4 I changed the sim card in my 4-s and now my wifi is not working, grayed out in fact, I also noticed that the modem frimware was an older version now on the 4-s than the 4, HELP

The modem firmware has nothing to do with the SIM card or WiFi.  Was your 4S EVER jailbroken?,  See this reguarding grayed out WiFi setting:
iOS: Wi-Fi settings grayed out or dim

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