Mic problem & warrenty issue .

Hiii
I have iPhone 4S which is having mic problem i guess.During voice calls the call receiver at other end unable to hear my voice on handset mode but on speaker mode he can hear my voice.
Also wanted to know in which country my phones warrenty is valid .
iPhone4S
Model: MD241LL/A
Serial No.: DNPHN0Z3DTD6

Hi Alankar,
Make sure your iPhone case is not covering the mic. It is on the bottom to the right or left of the connector. Have you tried a call without a case on the phone?
Your Model Number indicates that this is a US phone, so the warranty would be valid in the US.
Cheers,
GB

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