Interference I have interference with stelpro thermostat ; when the phones are plug I hear a sound in the thermostat lfor 1 or 2 second at low intensity. I took of the phones and the sound stop.

I have not seen this issue and the manual gives you the option of either off or dim to high upon key depress.
Manual:
0280 Backlight 0 Backlight on for approx. 8 seconds after keypress 1 Backlight always on low intensity, full bright after keypress (requires 24VAC connection).
I am sorry I can not offer any further info.

One of the main differences is the stelpro is 110 volts and the uberhaus is 240.

Your phone is on mute , or there is somethng like a toothpick stuck in the earphone plug... wouldn't hurt to take it to your carrier... ??

LG CE 0168 NO CODE CAN UNLOCK THIS PHONE?

Without a compressor analizer you will need to check the winding
resistance. or you can just cross your fingers and hope the relay
and start capacitor are the problem. Sounds like the condenser coil was plugged so you could possibly have a locked up compresor.I doubt it is low on refrigerant charge.

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."

Good luck from Headsets Direct!

sounds like one has a low battery.

Locate phone away from devices which may interfere, basically anything with a transformer. Dont use long extension cords to connect phone to a wall jack that is far away. Plug ac power adaptor into spike-strip line filter like an isobar. Try another extension cord and/or a different location to see if you can isolate the cause of interference. Interference will get in 1 of 2 ways, through the phone line, or through the power supply.

go to "settings" or "sound settings" (anything relating to sound settings or setting")
you should find volume control settings for increasing the ringtone.
if it is still low after doing through that process mybe it is time for you to change you sound speaker(they do normally get worn with constant use and would need a change)
good luck.

firmware update, may help.