I have exactly the same problem with my microphone and it started at in mid November. I tried factory reset, reinstalled the phone software starting from version 1.5 and updated back to 2.1 - nothing helped so far. People can hear me only if I use the Speakerphone function.
The model of my phone is Cliq MB200.
I need help too. Can this be a T-Mo problem?
Mine is doing the exact same thing. The charging issue has been a problem almost since almost day 1. I also have the problem with it freezing and resetting itself whenever it wants (at one point it happened 4 times in a row).
Last week my mic quit working on my phone and I was able to use a headset. Well, as of yesterday that is no longer an option either. The only way I can talk on my phone is to use the speaker phone. This must be a T-Mobile problem and I am very disappointed in this phone.
I have had it since October 2010 and have had nothing but problems with it. When I contacted customer service, I was told because the insurance was not added at the time of purchase there was nothing I could do about it. I bought my phone in a store and told them I wanted the insurance added. I should have double checked everything because it wasn't until I received my first bill a month later that I realized it was left off. I have had nothing but problems with my phone and T-mobile as a company since I began using them in 2010.
I'm tempted to go back to Tracfone because the phone I paid $20 for in 2005 still works today and my son now uses it. Sad that a $400 phone doesn't even last a year.