Earpiece on new iPhone 4 not working after upgrading to 4.2.1

I purchased my first Apple product (iPhone 4) 3 weeks ago with firmware 4.1. Finally I decided to upgrade to 4.2.1. Now when making a call I can't hear a tone or anyone talking to me. Switching to speaker works fine and so do the earbuds when connected. I read many have had the same issue and they just plugged/unplugged their earbuds a few times. Seems the iPhone forgets that the earbuds were unplugged. I tried the same and it didn't help. There is nothing stuck in the jack either. Now what?

I'll lay odds there's a piece of lint or something stuck in the headphone jack. Take a look and try to get it out with a pin or something. Happens occasionally, pretty much always to men as opposed to women. Mainly because we tend to carry our phones in our pants pockets instead of a purse.

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Welcome to the discussions,
Did you see if there are any software updates for your new macbook available?
Did you try to log in as a new user and see if you can connect?
I read that in some cases installing 10.6.4 from the scratch instead of using the migration assistant worked.
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I have fixed this issue after upgraded my router's firmware finally, this is a completely compatibility issue between Apple and other third party manufactures, hopefully we can get compabitlity list for each future IOS version ahead of time which can potentially avoid such kind of embarrassing situations moving forward, thanks !

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Suggest looking here, much success has been found:
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File -> Export not working after upgrade from 11i to R12.1.3 in few systems. Can you please let me know what could be the issue.
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In Argument 1 - Type: Number Value: 54
Out Argument 0 - Type: String Value: 12
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Executing NAME_IN Built-in:
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Executing NAME_IN Built-in:
In Argument 0 - Type: String Value: system.current_block
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Executing NAME_IN Built-in:
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You don't like the answer?
Again it's not a bug, use a supported carrier if you want Personal Hotspot.
Read the list one more time, if carrier is not on the list, IOS7.1 patch the loophole.
Message was edited by: ckuan

TS1702 My app store, Apple ID, safari, and most other apps do not work after upgrading to iSO 6, How do i solve this problem?

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Super drive issue not working after upgrade of Maverick or Mountain Liont
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Earpiece on new iPhone 4 not working after upgrading to 4.2.1

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