Problem with Mootorola V360

I have a Motorola V360 on Vodafone, I had it unlocked as I have Virgin
300/300 sim. When first unlocked the display showed Virgin on screen. Since
taking the battery out it now comes up showing t mobile as the service
although it connects via virgin. ? The chap in the shop who unlocked it
states that is normal, "how can it be normal" if it displayed virgin prior
?. I said has the software gone faulty, he said now nothing wrong. I put the
sim in another phone show all ok. No big deal but has the unlocking buggered
it ?. Incidentally when I do a network search it does not now show virgin
just t mobile. Just any thoughts out of interest.
Thanks.