need help! lost my Iphone speaker sound

Just got my new iphone with a 1.1.4 firmware version. I unlocked, jailbraked and activated it with Ziphone 3.0, and everything was OK. started to enter my contacts manually, and at some point(I don't recall very well the exact moment) I realized that when I pressed the buttons I have no more sound coming out from my phone speaker. I'm very nervous because is brand new, so I tried some stuff that I Googled:
- the plug/unplug fast and slow out of the phone's jack
- the reset all settings
- clean the jack, even if the phone is new and no clog is there
- restore to it's factory settings(a full restore) and unlock again

I can still use it to make phone calls, I can talk and hear through my earphone, and everything is OK if I plug in the the headphone(buttons sounds and everything). But when I take out the headphones there is still no sound and I have to rely on my tiny vibrator to notify me when someone calls.

Have I done something wrong in the unlock process? the Ziphone is one click do everything...so....

I tried listening very close to the phone's speaker and there is an attempt to play the sound(I hear the sound but very very low). so the speaker is still working but there is "not enough" signal to play since I hear a dimm sound.

Is there some link between the firmware, unlock program, ITunes version?? should I try with a downgrade? or maybe a diferent unlocker or version of ziphone?

I'm pretty worried that I even searched for new jack assembly for the iphone, and found at about 25$, but since is a new phone I don't know if this is a hardware issue.

I've been reading there is the chance that the phone is trapped in headphone mode, but I can't seem to locate the sensor in the jack to see if there is something blocking it. If anyone knows some technical details on this please share. Is it just a contact that acts like a sensing sensor? Maybe if so there is a chance of a bad contact or something. It would help to have a jack schematic.....

If anyone has any idea please let me know how to solve this issue.

I'm going to try this....It's a great r to know it's not necessarily a hardware issue. I actually thought of buying the spare part for jack....but it seems more logical to be only a software problem since I only plug-ed in the stock headphones....if this is a compatibility issue between iphone and it's own headphones...then Apple has a big problem...

Doesn't any developer managed to implement like a switch to manually select the headphones or the speaker???? If not...there's an idea to bypass the jack plug-in detection.

I'm going to read about pwnage to see how this is done....and tell yiu about the results

Thanks PACMAC
but could you help me out with this PWNAGE. I'm on windows and found the win version of pwnage(winpwn), but I don't know how to use it.

Should I stay with the installed version that is already jailBroken and activated with Ziphone? or what is the exact procedure?

thanks

I understand now how pwnage works. it's about customizing the restore file of a firmware. But what software did you used to get pass the sound error??

"PWNAGE it.. i had that problem too.." is what you said, but no details

I'm very sure alphaod. Like I said I tried different combinations. A few days ago in the morning I was very surprised to see that my battery was empty!!! It shouldn't be because I've put my phone in sleep mode(the button on top), ....but it was empty. OK, I plugged in the charger and I was surprised to hear sounds on my phone. I thought I was still dreaming(maybe I was)
I went out and left my phone to charge and I had that morning a big smile on my face. Didn't know what I've done.....but it was back

Unfortunately the JOY didn't lasted to long...When I got back, don't know when how, but It was gone again....

So..I decided to buy the part that everyone states that is the fault(headphone jack). Since I'm not from USA this is kind of the way to solve my problem. I'm will be an engineer soon so changing a part is not that difficult for me.

It will be a wile to get the part but I hope for the best. Until then I'll try different tactics of approach.
If I find anything I'll post something. Pls if someone has a solution to this problem please post.

Thanks