on 19-01-2013 21:40
Just call customer service.If the number was on O2 they will send you a replacement sim with the same number.
on 19-01-2013 21:45
Not sure I understand the question but you can call from any phone. If the mobile you lost was on O2 you will have no problem getting a replacement sim.
on 19-01-2013 21:47
See jonsie's signature.
Sky Unlimited Broadband - Legacy O2 Simplicity 20 - Nexus 4 Android 5.1.1