Interesting this thread should come alive again after being dormant for a while. In the early days of my contract I was capped to 4 mbps and I hassled t-mobile for weeks on end until I spoke to someone who lifted the cap (he never admitted). One final phone call and suddenly upwards of 20mbps on H+, just how it should be.
Unfortunately it didn't last and recently I had noticed very slow speeds again and there it was the 4 mbps cap was back! Most of the time Youtube is un usable at anything over 240p resolution.
I have just had a small glimmer of hope after reading an article online, I have just tested it and it does seem to work. Not the full speed of HSDPA but it does seem far more stable and I am not getting repeated speeds over 5 mbps.
All I did was go into mobile networks on my phone and choose T-Mobile rather than using the automatic mode. How long this speed increase will last is unknown but I'll take it for now.
Now I know there is a sacrifice here and that is I can't use the shared network cell towers like Orange for 2g calls etc.
I am going to see how I get on with just t-mobile coverage and if its bad or I need to get better call coverage I will just swap back temporarily.
I am interested to know if this works for anyone else..... Good Luck!
Roll on end of contract!!