Changing out the ONT for a 2.5Gb one is necessary if getting a speed in excess of 1Gb ( the limit on the previous ONT ) but that in itself has no baring on the other service …you don’t say who that service was with , but unless it’s BT , this forum isn’t really the appropriate place for your comments .
Assuming it was BT providing the service that you no longer have ( the service on the remaining 1Gb ONT ) then EE is irrelevant, report it not working to BT , that’s got nothing to do with EE .
If both services were with EE ( then this BT forum isn’t really appropriate ) but in general there is no barrier to having two services unless EE have some self imposed limit , if they decide to only give one service that’s entirely up to them , but obviously if you are paying for both they should supply both , if they have ceased one and stopped charging for it , then if that’s their policy, there isn’t anything you can do about that .
It worth mentioning that if you both had 900Mb services , which is actually 1Gb but sold as 900Mb to keep the advertising industry happy , then effectively doubling the speed of one to the 2Gb ( sold as 1.6Gb service ) sort of makes the second service redundant, you basically have the same speed from one ONT that you had from two ( that’s assuming both were 900 ) , if one or both services were less than 900 then the aggregate speed is more than doubled, so why do you need 1.6Gb and more ?
Perhaps you have a reason to have 2 separate services , but apart from redundancy on a power failure on an ONT , there is no realistic backup , because optically both the are the same ( the same fibre to the headend ) , so any failure is likely to affect both ( that’s assuming you get the second one back into service )
if your intention is to simply more the other service to a new ISP , contact whoever that is , and ‘hope’ they take over the ‘service’ on the 1Gb ONT .
