Read how to avoid unskilled workers.

What to avoid from non-qualified Telephone Engineers
Cheap DIY extension kits. These kits are usually very poor quality, look unsightly and are prone to breaking easily.
Poor quality extensions that can impede your broadband performance.

Cheap extensions use multi-strand cables that can slow down your broadband speeds.
Companies that advertise and only give you a mobile number. These ‘companies’ can easily disappear and not be contactable again if/when the work they do goes wrong.

Any business that fail to offer an invoice or some form of guarantee for the work that they carry out.
Any workers that are uninsured. Any professional working on your home should have some form of liability insurance.