Swapping SIM cards

[Moleshome]

I've got a UK iPhone activated on the O2 iPhone tariff.

I also have a company provided mobile phone which is also with O2, unfortunately it is not enabled for data and I cannot get it enabled.

If I jailbreak and activate using my company provided SIM does the iPhone retain it's activation for my original SIM? If I swap between the SIMS would I have to re-activate each time?

[Moleshome]

Well I bit the bullet.

Downgrade to 1.1.1, jailbreak, oktoprep, upgrade to 1.1.2, jailbreak. The new SIM didn't need to be activated and I can swap between them.