M_I_C_H_A_E_L: Im on 2D and just went from 1:59am - 3:00am automatically :)
In most cases this is nothing to do with the network, it's simply the phone being aware of DST.
If you've got a Nokia made in the last ~8 years it will automatically change time, the only catch being if it does not have newer firmware that is aware of the DST changes a few years ago then it won't change on the correct dates,
Vodafone do not support network time updates. This has been discussed numerous times on here. While it is a nice feature it's actually supported by very few GSM/WCDMA carriers around the world.