They really do want old t-mobile customers to get onto EE methinks
Over on TBB's forums, I had this to say:
Consider it as the start of the process of getting people to swap from the T-Mobile and Orange brands to the EE one. BT won't want to keep the French and German brands around too much - and are perhaps under a requirement to drop them gradually.
EE's internet add-on costs the same amount per month (£5), but there isn't a 6 month option. Both give you 500 MB for the month, but EE's is a hard-counted limit, whereas T-mobile's is a softer "fair use policy" that might not be enforced well.
I'd guess that the new £12pm charge will motivate all the minimal users to move (to EE, or away), but it will leave the heavy users behind. They'll then start getting ToC'd away too.
My gut feeling is that this is ultimately more about branding than revenue generation.
.... (thesedays, the new owners have got to pay for those footie rights somehow, I suppose ...)
I suspect that money might come from the people paying multi-gigabytes per month, not those on half a gigabyte.
Incidentally, I currently use EE's PAYG setup, and get more data than this, at a lower price ... though it takes a while to build up.
I'm on one of the weekly packs, at £1 per week, £4.30 per month, which starts at 100MB per week (plus some voice & text), 430MB per month. However, EE offer a boost every 3 months, such that your £4.30/m buys 640MB/m after 3 months, 860MB/m after 6 months, etc. Mine is currently over 1GB/m,