WiFix Manager1.32 - Google Play
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Official Google Play Link
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Publisher Description
It seems many people having issues with WiFi in 4.0 builds when SIM-Card is inserted.
WiFix tries to solve this problem by changing the WiFi country code.
Using WiFix Manager you can easily install/update WiFix.
NOTE: Make sure to dial *#94349# (*#WIFIX#) after installing WiFix.
Visit http://www.fardjad.com/android/wifix/ for more info.
WiFix and WiFix Manager are licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Visit http://creativecommons.org/licenses/by-nc-nd/3.0/ for more information.