Help My IDEOS always disconnected from "market" when downloaded

[Kartiko]

I just had IDEOS S7 on my hand yesterday. On first time everything was normal, when it's hooked up to the wifi all the functionality is working.

The problem come, when it's inserted with SIM Card (no longer use wifi), the request to download any apps from "market" is always disconnected.

I try many things, from "restart" up to clear the cache...but still didn't worked up.

Please anybody inform me what should I do......??

Thank you...

Kartiko
Jakarta-Indonesia