Up to 90,000 households could face digital TV interference issues as 4G services in the 800MHz spectrum go live later this year.
At800, the organisation responsible for mitigating the issue, said that based on its current trials in areas such as London, Brighton and the West Midlands, many households will be affected.
In the London area it is now sending out postcards explaining about the 4G switch on and how it could cause problems, and what to do in case issues do disrupt services.
However, at800 said it did not think many homes in London would have problems as the Crystal Palace transmitter has a strong terrestrial television signal and its frequency is quite far from the 4G 800MHz band.
Although, 90,000 seems like a lot, it is likely to be far lower than was first feared by the authorities responsible for setting up the at800 organisation, with investment of £180m from mobile operators to help fund the body.
Earlier on Thursday EE, the only UK network provider currently offering 4G, reached over 500,000 customers. EE also announced pay-as-you-go deals for 4G services as it seeks to capatilse on its head start over rivals O2 and Vodafone, but the firm has not yet released pricing.
Intel's neural network USB stick could bring AI to the masses
Dubbed Barnard's star B, newly discovered planet is believed to be rocky
Also, what's a USB stick?
Gravitational waves become extremely weak by the time they reach the Earth and require highly sensitive equipment for detection