I can't get the volume to go up and hear clearly when I have a phone call. Also, I can't hear when I get a phone call in on my headset.

You have the 'Mute' turned on. With the H730 turned on, and wearing it, press and hold both volume buttons until you hear a beep, or a voice prompt. Then try making a call. If that doesn't work, repeat the process. Good luck.

did you check the volume?

may placing a call check the volume at that time for the Phone.

There may be linking issues between the headset and the phone. Page 11 of the user guide offers these suggestions. Also, here is a link for re-pairing your headset to the phone:

Plantronics Explorer 230 Pairing Instructions

Remember that you want to purge any possible bluetooth interference from your phone.

"Callers cannot hear me or I cannot hear caller/dialing tone:
The headset is not turned on or the headset is not connected to mobile phone. Press the call control button for 2 seconds until you hear a beep or see the indicator light glow blue to turn headset on.
Your headset is out of range. Move the headset closer to the phone or Bluetooth device.
Your headset battery is drained. Charge your battery using the AC power adapter supplied.
The listening volume is too low. Press the volume key up (toward the earloop) to increase the sound heard in the headset."

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By having your microphone set to level D, try setting it on A while talking to someone who can here you while you switch through. Most systems are set to B for standard use. On the back of the unit is an up or down microphone, that would allow your voice to be made higher or lower.

Good luck from Headsets Direct - 800-914-7996.

It could be that your unit is defective and may need to be replaced but here is some information for you to check out from the user guide:

1) Callers cannot hear me, or I cannot hear caller/dialing tone.
The headset is not turned on or the headset is not connected to mobile phone. Press the call control button for 2 seconds until you hear a beep or see the indicator light glow blue to turn headset on.
Your headset is out of range. Move the headset closer to the phone or Bluetooth device.
Your headset battery is drained. Charge your battery using the AC power adapter supplied.
The listening volume is too low. Press the volume key up (toward the earloop) to increase the sound heard in the headset.

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Please see the link below for the User's Guide.

• Headset is muted. Long press (3 sec.) the volume down button on headset to unmute the microphone. See page 16.
• Improper positioning of voice tube. Try various other positions.
• Voice tube may be clogged. Remove voice tube and test to see if callers can hear you without it. If they can, then replace the clogged voice tube. See page 18.
• Speaking volume is too low. Increase the speaking volume by
adjusting the speaking volume minor adjust buttons on the base unit as described on page 16. If the volume is still too low, select another speaking volume major adjust setting as described on page 16.
• Incorrect configuration dial setting for your phone. Try other
phone configuration dial settings on the base unit. Ensure the
selected number is in line with the position indicator. See page 14.

Plantronics CS70 User's Guide

Good luck from Headsets Direct!

There are a couple of basic things to check first. You want to make sure the mute is turned off and your outgoing (mic) volume is loud enough (there is the speak level switch on the side and the speak volume control on top). Also, you want to make sure it is connected through the handset jack on the phone (generally it will not work through the headset jack on the phone). Finally you want to make sure it's configured right (scale located on the side).

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You don't say what kind of interference you are experiencing. If it is humming, adjust the compatibility switch until the sound is clear. If the caller cannot hear your voice, make sure that the mute button is turned off (indicator off). Increase the outgoing volume by adjusting the speak volume. Adjust microphone closer to your mouth. Make sure the telephone handset hook is off the phone. Make sure all cables connections are correct and firmly in place.

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Try adjusting the volume not only on your bluetooth but also on your phone as well. The 2 volumes are not associated with each other at all. If that does not work still, your Bluetooth may not be compatible with your phone or you may have a defective bluetooth. Make sure you within 18 feet of your phone when talking on your bluetooth. Hope that helps!

Checked the volume on the headset? As well the volume on the phone