what's the problem about china unicom SIM card?

[kevin1020]

when I use china mobile SIM card, everything is OK,

but when I change it to china unicom SIM card, the network logo should not be "G", instead of double arrow signal together with "X" signal.

why it show me this? ( but I can norlamly use my mobile phone in phone and GPRS and going to internet).

Could anybody help me?

[Rudegar]

did you put in the network settings for the other network ?
as in apn and username and the likes?

[kevin1020]

no, I find the netwrok automacticly, and select china unicom network,at first the network logo is OK like "G",

but after several minutes, it changed to arrow signal