South Suffolk MP James Cartlidge visited a mobile phone mast in Long Melford which has been upgraded to offer enhanced 4G access.
The mast now uses low-frequency spectrum, which travels further than the regular 3G service normally used by mobile phone companies.
It means users can access the internet and make calls in more places than before.
The service – known as 4G Super-Voice – is available on mobile operator Three.
Mr Cartlidge has been campaigning for better broadband and phone coverage since he was elected to Parliament in 2015. A recent petition he launched calling for better phone coverage was signed by 3,700 people.
The Government is working with the mobile phone industry to change regulations on mobile phone masts that will allow mobile operators to upgrade and repair them quicker.
Mr Cartlidge said: “I’m pleased that more South Suffolk residents will be able to use their phone to make calls, send texts and access the mobile internet in more places than ever. I will continue to work on further improvements.”
Customers who want to access the new service will need a compatible handset. To find out more, go to three.co.uk/4G-Supervoice.