Contract is direct from T-Mobile and I was always under the impression I was getting best speeds, but now I realise I am not - boooo to that !That isn't how the sharing agreement works.
It will switch to an Orange signal if you can't get a T-Mobile signal, you can't choose.

All interesting reading.....and so I downloaded Speedtest and found my T-Mobile 'H' connection is only getting me 380kbpsContract is direct from T-Mobile and I was always under the impression I was getting best speeds, but now I realise I am not - boooo to that !
Renewal time due in a couple of months, and - by the looks of things - can likely get proper HSPDA speeds elsewhere......always happy with T-Mobile's data limits (more or less unlimited for me, I think nominal 3GB IIRC) - perhaps I need to see what my actual typical use is, as quite possibly I can benefit from faster connections offered elsewhere, but had always been a little worried by data caps.
Slightly off topic, any good recommendations for an app (Android) to monitor how much data is actually used (non-wifi) per week/month ?
If you are on a 500mb FUP it does say 3G in the terms, so no HSDPA for you i'm afraid.
But not sure of speeds....thing is, I definitely get quicker when 'H' is on, as opposed to '3G' (circa. 250kbps) or 'G' - just not that much !I use Net counter to monitor both wifi and 3g (HSDPA) connections. It's free in the marketplace.

3G & HSDPA are both the same thing, UTMS. Unless they define 3G as a level of service (first release UMTS upto 384kbps) separately from HSDPA (a protocol extension of the former) then I'm going to say you're probably wrong.If you are on a 500mb FUP it does say 3G in the terms, so no HSDPA for you i'm afraid.