BT is expected to make a formal submission to the Competition and Markets Authority (CMA) this week over its intended takeover of EE.
After BT shareholders gave their approval to proceed with the £12.5 billion acquisition, the telecoms giant is set to outline its case to the UK's competition watchdog, reports the Telegraph.
A number of rival broadband providers - including Sky, TalkTalk and Vodafone - oppose the deal, which would enable BT to offer super-fast 4G services across much of Britain.
But BT is expected to argue that the takeover of EE will lead to lower prices for UK consumers.
In Europe, where mobile services have been bundled with home broadband, landline and TV, it has led to more affordable packages.
BT is expected to address a number of issues in its submission to the CMA, including the future of Openreach, its mobile spectrum holdings and the mobile wholesale market.
Regulatory approval is needed from the CMA in order for BT to proceed with its EE deal.