[liton]

Hi

One of my friend bring me a phone which was having the problem that sometime it shows NO SERVICE, i try to fix that by doing the firmware upgrade to 1.1.1 and then again downgrade to 1.0.2 but always i found it shows no service.

Sometime i noticed that the signal comes with network name and then stay like in 5 second or just shows the full 5 signal bar but no network name which drive me crazy, at last after several try i was able to solve it and to me it might be the problem with the bottom back part under the antenna cover.

When i was not able solve this issue by doing the firmware upgrade and downgrade then what i did it at last just hit 3-4 times hard (Not so hard that it broken! ) and re-start the phone and i got the full bar with all available network list and after that it is running well still. I try to turn off the phone and change to new sim card and found it works well.

What i feel that there might be some loose or very tight screw at the antenna point which makes the problem of suddenly no service issue.

Can anybody share their situation about this matter.

I am happy that it is now running well without any problem

Thanks!

[g-rza]

i was having the same problem with the no service msg/funky bars in the top left. i use t-mobile and it would flash between "no service", "t-mobile", and the bars would fluxuate. i could make calls, but when someone would call me it would go straight to voicemail. i couldnt text, but could receive them. the problem ended up being that i had the 04.02.13_G modem firmware. my phone was in 1.1.1 at the time. (you see, i had accidentally upgraded to 1.1.2 and had to downgrade the firmware... i guess it leaves the baseband.)
anyway, the solution is this:

using installer, go to sources and tap edit. then add http://i.unlock.no as a source. let it refresh, and navigate to unlocking tools. download the baseband downgrade. it will give you 03.14.08_G. it will also flash the baseband.

you can now proceed to restore to the 1.1.1 firmware with itunes, then jailbreak and anysim as usual. if you need a tutorial for this, youtube appsnapp.

(edit)
my modem firmware is now 04.01.13_G, and all of my services run well.
hope this helps. my phone is default 1.1.1, out of the box. fyi.