Iphone 4 - NO SOUND

I'm a huge fan of Apple BUT I am so frustrated with my history of Iphone 4's. I got my first Iphone 4 last January and was quite happy with it until it started loosing sound (I could not hear when someone would call unless I had it one Speakerphone). The weirdest thing was that it was come and go! Since I live in the Philippines, and Apple support through our network *****... I decided to wait until my planned trip to New York last June. I was very happy with the service as they were able to replace it with a new Iphone 4... Fast forward two months later, I'm back in the Philippines and again the same problem happens!!! This time it's worse! There is no sound, you can't hear anything when you call even if you TRY to use the speakers! No sounds when I play any songs and now the videos I have on my phone won't even work because of the sound problem!!! I swear I didn't even drop it or anything! This is basically what happened, I connected my Iphone to the tape deck of my car, but for some reason the music was only coming out of my phone speakers and not the car speakers. I decided to turn off my phone and try it again... THAT WAS IT, GOOD BYE SOUND. Oh, I forgot to mention a few days after I got it in July it actually did loose it's sound BUT all I had to do was turn it off and on again then it was fine... so I figured it was a fluke... NOW I regret that decision, here I am back in the Philippines and my phone is basically useless. Does the Iphone 4 really have bad harware when it comes to sound OR I am really just **** unlucky?!!!! 2 rotten eggs!?!?!! Now I need to deal with my crappy network and see how they can handle the problem.

Rumor has it, that it takes 5 months to a year for Globe to get their act straight!?!! Talk about service. If only I could send my Iphone back to the US and ask for a replacement and this time pray that I won't have any more issues with it.