Samsung Galaxy S :: Roaming R Indicator On?

Got a UK purchased unlocked Galaxy S, which I'm using in mainland China on China Mobile with a China Mobile SIM. On the screen the roaming R indicator is on, by the signal strength. And going into the about the phone options does indeed indicate that it is roaming internationally, when in fact it's not, because of the China Mobile SIM working on that network. When I was using the phone in Hong Kong, I was using a 3 Hong Kong SIM and the Galaxy didn't indicate it was roaming at all. It did however show the R roaming indicator when I entered mainland China, Where the 3 HK SIM was working on the mainland Chinese networks, both China Mobile and China Unicom. It should not be showing roaming R though when it's using a China Mobile SIM on it's own network though, but it is. I've also tried the SIM in another phone, and this does not show it's roaming at all. Only when the SIM is in the Galaxy? The phone does dire warnings about incurring large data bills for data roaming, when it's not in fact data roaming.