Network speed, performance and coverage is being boosted and there is a small chance these upgrades may cause interference to programming received through an aerial such as Freeview, BT, TalkTalk and YouView.
Cable and satellite TV, such as Sky or Virgin, are not affected.
Symptoms could include intermittent sound, pixelated images or complete loss of signal.
Free help is available from Restore TV, whose role is to ensure people can continue to enjoy free to view TV when mobile is upgraded in their area. It provides help to anyone experiencing interference to TV services caused by mobile signals.
Residents are more likely to be affected if they live in an area with weak digital television reception, have a TV signal booster and whose TV aerial is close to a mobile mast.
Additional support is offered to those aged 75 or older, are registered blind or partially-sighted or receive personal independence payments (PIPs), attendance allowance, constant attendance allowance or War Pensioner’s Mobility Support.
Ben Roome, CEO of Restore TV, said: “We know just how important TV is to inform, entertain and provide welcome company. Restore TV exists to ensure we all can continue to access free to view TV as mobile services are improved across the country.
“If you see new TV interference, we’re on hand to help you resolve the issue. We can send a Restore TV filter, free of charge, for you to fit between your aerial lead and TV or set-top box to remove mobile signals and allow you to watch free to view TV as normal. Full instructions are included, and we can provide further advice online and by phone if needed.
“In most instances, fitting the filter will resolve any issues, but, we may also be able to arrange a follow-up visit from a Restore TV engineer at no cost, depending on eligibility.”
Anyone experiencing difficulties can call 0808 13 13 800 or find out more at restoretv.uk.