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What is DMSL?
Established in 2012 Digital Mobile Spectrum Limited (DMSL) supports the interference-free use of radio spectrum in the UK. The company was set-up to run the at800 support programme and has managed this work since 4G at 800 MHz services began operating in the summer of 2013.
We are funded by and represent the UK mobile operators that hold allocations of 800 MHz spectrum: EE, Telefónica UK (O2), Three and Vodafone.
We are overseen by a board representing viewers, broadcasters, Ofcom and the Department for Digital, Culture, Media, and Sport. This 4G/TV Co-existence Oversight Board monitors, advises and reports on our performance.
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- What is 4G? Why is it being introduced?
- Why might 4G affect my TV?
- How will I know if my TV is affected?
- I am missing some Freeview channels. Is this caused by 4G?
- Will 4G affect TV received through satellite or cable?
- Will TVs in caravans, campers and narrowboats be affected?
- Will I see interference on devices such as 4G handsets, radio, tablets and computers?
- Where can I find more information on which areas have 4G coverage?
- Is it true that millions of homes might be impacted?
- I live in London, will I be affected?
- How will at800 let me know if my Freeview may be affected?
- My neighbour has received a postcard and I have not. Why?
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- Can I fit the filter myself?
- How can I get a filter?
- What if I have a set-top box?
- What if I have an indoor TV aerial; can I still attach a filter?
- What if I have more than one TV running Freeview?
- What if the filter doesn’t resolve the interference?
- Can I get more filters if needed?
- I am moving house, do I need to take my filter to my new home?
Our online diagnostic tool will help you identify what might be causing disruption to your Freeview service.