The 30m (98ft) mast will replace an existing one of similar height at Broad Lane, Nether Poppleton.
Research shows no adverse health effects yet one cabinet membe did not want 5G technology "outside her bedroom window".
A phased deployment will see 5G coverage extended across Guernsey over the next four months.
Telecoms infrastructure firm MBNL say a central location in Keighley is needed to ensure a good 5G signal.
Customers of various phone companies could not use their phones due to a damaged mast at Wyke.
Sunderland City Council is due to consider the application to upgrade a rooftop station.
The monopole would be installed on Hospital Fields Road, off Fulford Road, if approved.
Competition regulators are pleased customers switching providers can now keep their mobile numbers.
A deal has brought forward the date for technical work so customers can keep their number.
