Phone band (4)
I believe the answer is:
ring
I believe this is a double definition.
'phone' is the first definition.
('ring' can be a synonym of 'phone')
'band' is the second definition.
('ring' can be a synonym of 'band')
(Other definitions for ring that I've seen before include "It's carried by Frodo" , "item to be fingered?" , "Surround; reverberate" , "Circular band; call" , "Contact" .)