I evidently dropped my Motorola H700 Earpiece and lost Mic Cover

I used a sharp push pin to wedge between the inner and outer halves of the mic. Once you get it started, just keep working around it until it pops off. If you need to remove the mic arm from the headset, squeeze or pry the metal hinge spring clip together to remove, then gently tap to remove plastic bushings that the spring clip retained. Reassemble in reverse order.

If you carefully pry open the mouth piece (start at the hinge) you will most likely find a small piece of black fabric looking stuff covering the mic. just pull this off as it is not needed it is meant to be glued inside the rubber piece. Chances are it got left in a hot car and the glue heated up and fell off and got stuck to the mic.
good luck

With the boom "closed", depress center button until it is purple. Release the button and extend the boom. The light should now be a constant purple, and in pairing mode.

I used this solution and it worked...good luck with yours: http://www.geocities.com/jconkwright/H700fix.html

Ok here is the answer. There H700 have a small foam windscreen inside over the microphone that over time block the sound. The answer is to carefully open the unit and remove the obstruction and clean residue from the microphone and it will work like new. here is a link to pictures and instructions. http://www.geocities.com/jconkwright/H700fix.html

I signed up JUST because this solution worked:

"Hmm this may sound like a stupid solution that doesnt work but what i did is...,

#1 I Held the button to make the violet light go on
#2 when the violet light is on dont just flip the boom mic, flip* the earpiece with it.

*note: when fliping the mic and earpiece, dont open slowly, flip it open fast and keep it there." I do want to note that my passcode was reset to nothing during my 3 months of troubleshooting.

Not going to mess with it.

To successfully pair the Motorola 700 with the Centro:
Select Bluetooth from the Home screen.
Select "On".
Under "Visibility", select "Visible".
Now click "Setup Devices".
Click "Hands-free Setup"
On the Motorola earpiece, with the flip-out mouthpiece in the closed position, press and hold the multi button until ring around it glows purple. Flip open the mouthpiece.
Now click "Next" on the Centro's screen.
The Centro should find the Motorola. Hold the Motorola to the right side of the phone if you have difficulty getting the Centro to find it.
Once found, click the Motorola H700 listed in the window and click "OK".
The Centro will ask for the device password. Enter 0000. Be sure that the checkbox for "Add to trusted device list" is checked. Click OK.
The two devices should now be paired to work together and the Motorola's multi button should rapidly blink blue; NOW click "Done".
You will be taken to the Trusted Devices screen.
You will see your Motorola in the list of Trusted Devices. Click on it to highlight it, if it is not already highlighted.
Click the menu drop-down key (located to the right of the ALT key).
You will now see a drop-down at the top of the screen that says "Connect". Click the "palm" center button on your Centro.
NOW the two devices are connected. The phone name will now be bold, and a small Bluetooth icon will appear to the right of it.
When you click the Phone key on your Centro, you will see a tiny blue headphone symbol now at the top right of the screen where the Bluetooth icon used to be.

To use the earpiece:
Flip it open and hang it on your ear.
Dial the number you want to call on the phone.
Press the multi button once and now you should be connected via the earpiece.
To receive a call, when your Centro rings, press the multi button once.

It took me a few hours to figure it out. Hopefully you can do it in a few seconds.

http://www.geocities.com/jconkwright/H700fix.html

This is how I fixed the same problem on mine. I wear it outdoors all the time and it probably got wet and deteriorated the foam on the mic.

http://www.geocities.com/jconkwright/H700fix.html

I followed the instructions and it took 5-10 minutes to get it done. I am now talking on the phone and I can hear and be heard!!!! Take y our time and be carefule but it worked for me.

Thank you. I called a 1-800 number for tech support but they told me I had to wait 14 days from the date of purchase before they could help me. Your suggestion was right on the money. Thank you.