It admits that this is just phase one of its roll-out, with "full next-generation 5G" not available until 2022.
Another major mobile carrier, NTT Docomo Inc., said the same day it will stop taking orders for the new Huawei handsets, although the company said last Thursday it will launch a new high-end Huawei model in the summer.
'We've started with 5G in some of the busiest parts of the United Kingdom, the widest range of 5G devices in the United Kingdom, and plans that give customers the best mobile connection and great benefits. 5G will create new experiences with augmented reality, make our customers' lives easier, and help launch entirely new businesses that we haven't even imagined.
"Until we have the information and confidence that ensures our customers will get support for the lifetime of their devices with us then we've got the Huawei devices on pause".
The Trump administration's order last week cuts Huawei's access to American chips and Google, which makes the Android operating system and services for its smartphones.
Kester Mann, principal analyst, operators at CCS Insight said: "Being first-to-market with 5G matters little to consumers, but is clearly an important honour for BT".
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Allera noted that customers can expect speeds of around 150Mbps on average, but will potentially hit up to 1Gbps at quieter times.
However, EE does intend to use Huawei within its radio access network (Ran), which allows users to send data to and from the core. "We'll provide updates on any future smartphones in due course".
But Mr Howett thinks that a ban on Huawei could be problematic, not just for EE but for all the UK's operators, because it is in a significant part of their networks.
And on Wednesday mobile carriers in Japan and Britain said they were delaying releases of Huawei handsets.
Aberdeen, Bournemouth, Brighton, Cambridge, Dundee, Exeter, Ipswich, Norwich, Plymouth and York are on the list to get 5G coverage in 2020.
At launch, EE says it will offer SIM-only plans from £32 per month which will include 20GB of data.