@herrbohnen
I wouldn't bother, its **bleep** compared with the older digital system X, drops calls and when you answer there are 2 or 3 seconds before the transmission starts.
This doesn't surprise me. Digital radio transmissions are a few seconds behind analogue (just put an FM and DAB/Freeview radio together on the same station and you'll hear the difference - especially on the hourly Radio 4 pips. It was the same with digital versus analogue TV before the latter shut down - that's why they stopped showing the clock before TV news bulletins, because the displayed time was no longer accurate to the second. I think it's because analogue travels in a straight path but digital needs to be decoded, hence the delay. And although digital is less prone to interference than analogue, when interference does occur the signal tends to drop out altogether and become unlistenable/watchable, whereas an analogue broadcast can tolerate a lot of interference.
Hmm, I used to live in Rugby Warwickshire which had a very early System X exchange - probably one of the reasons almost everyone moved to CovCable/NTL/Virgin! *It was never reliable!