What does Gamma mean on the notification area and lock screen of an S3 mean?

Is it something that can be changed?

Should the network name show at the bottom of the notification tray and just above the emergency call button on the lock screen?

Network name should show on notification tray at the bottom, don't know about above emergency call button on lock screen as don't have that on my phone.

Mine shows above the emergency call on the lock screen.

Gamma are a re brander of 3 network services.

We used to have them at work and instead of 3, O2 etc it said gamma.

Could this be it?

Seems we're on some virtual network via Vodafone.