Netgear - voip phone

Hello everyone,

I've been loving my MR2100 for the past 6mths.

I use wi-fi for my devices. I recently got sent a VOIP phone from work and when i plug in the ethernet cable the phone works fine but my wi-fi disables. I have checked tethering and have USB tether checked. The USB tether only (disables wi-fi) is not checked. I tried all kinds of changes but it still won't work. Any help would be very much appreciated please.