to UK people about mobile numbers

[Kurosagi]

Just wondering,how do you tell if your contact list are on what network without asking them?? since i'm on o2..and i use the o2 unlimited tarrif i was wondering how do you tell if people are on O2 etc

[DanTheBanjoman]

In .nl with Telfort you can tell by looking at your call overview. It mentions the calls that were made to other Telfort customers. Though I can't tell what provider the rest are using.