Cornerstone Church says the decision to work with EE has led to many ministry opportunities.
Last Sunday, instead of running the usual Sunday service, the church took the opportunity to reach out to football supporters by gathering in the church car park to serve tea, coffee and biscuits to connect with the community.
Minister of the church, Richard Evans told Premier: "We had lots of good conversations and we connected with people who had kind of been in church and who had drifted away and there was an opportunity to pray too.
"There were conversations just in general, there were also those as well that weren't interested.
"But the fact that we were there and available to people just made that opportunity for those conversations to happen.
"We want to do this more and more, to just connect with people outside the church and to be that fragrance of Christ, wherever we are, whatever we are doing."
Watford are surprising participants in Saturday's FA Cup final when they'll take on Manchester City.
Stay up to date with the latest news stories from a Christian perspective. Sign up to our daily newsletter and receive more stories like this straight to your inbox every morning.