I completed HW unlock and now I am running 1.1.2 on tmobile. Phone, SMS work. However, I lost the wifi. Can find any networks. Obviously wifi was working because I used it to download Any SIM .

Can anyone recommend a solution?

tried a restore?
if that doesn't work, consider upgrading to 1.1.3, then downgrade to 1.1.1 where you can downgrade the baseband.
tell us how it went

if he upgrade to 1.1.3, he still can downgrade to 1.1.1??

i saw many guide saying do not upgrade to 1.1.3

There is a big chance, that you just damaged your wifi antenna (cable). MAybe you should reopen the iphone.

Originally Posted by xiiaoben

if he upgrade to 1.1.3, he still can downgrade to 1.1.1??

i saw many guide saying do not upgrade to 1.1.3

He succesfull HW unlocked, he has a 3.9 BL then, so you can down-upgrade all the like.
On 4.6 this is a no-no

Originally Posted by Kds

I completed HW unlock and now I am running 1.1.2 on tmobile. Phone, SMS work. However, I lost the wifi. Can find any networks. Obviously wifi was working because I used it to download Any SIM .

Can anyone recommend a solution?

Hi, had the same issue.. I reopened the black cover and checked if the antenna cable (white cable with small connector in the middle axes of the iphone, close to the starting edge of the aluminium back cover) was plugged properly, which was not.
I plugged it properly and worked since then.
Pino