[Q] Help: New wifi antenna kills cellular connection topic

Hi folks,

I jinxed myself. Yesterday I crowed over successfully replacing my M919 S4 wifi antenna, gaining better wifi performance by about one wifi bar around my house. (The thread is here, if anyone is interested) Basically I just felt my wifi reception was weak enough to suggest a problem, and I wanted better wifi coverage when not right next to a wifi router, so I popped for a few bucks to try a replacement antenna. It seemed to do the trick.

I didn't notice until I left home this morning that swapping the wifi antenna killed my cellular connection. No bars, and "No Service" was listed. Huh. At work, with no tools, I did the usual stuff. Remove/replace SIM, pull battery, no joy. At lunch I went and got a screwdriver. Disassembled / reassembled the unit (took off screws and frame, made sure no bent contacts) etc.. No joy. Went to nearby ATT store for new SIM, no joy.

Came home, and on a lark took out the new wifi antenna and put the old one back in. Rebooted, and all was back to normal. Fine cellular service right away, and back to the previously somewhat weak wifi reception.

I don't understand what could cause this series of events. To be clear, here's the part I used:

http://www.esquareparts.com/product/...na-flex-cable/

Is the WIFI antenna also part of the cellular system antenna, and is there a failure/defect mode that would explain why this replacement part would kill cellular service while working fine for WIFI?

I'm very confused. I want to get back to stronger wifi reception, WITHOUT killing my cellular...

Help!