Hi,
Have you tried connect a different handset?
If there are any extension cables in between can you disconnect it and plug the phone directly in the phone socket from the wall?
If you have a cordless phone have you tried replacing the batteries and made sure all handsets are placed properly in the bases?
If I've helped in any way, please give me Kudos and mark my response as a helpful answer!
Fancy £50 off your bill? Ask me how and you might just get it!
Rob
Here to help! I'm a technician helping out whilst working from home. Find out more