HEllo

I bought my unlocked iphone 2 days back. For some wierd reason, today i went onto settings, then phone, then sim applications. In here, there was this tab with something chinese written on it. I clicked it.

I dunno if there is any connection. But now whenever I make an outgoing calls, I get the message 'call failed'. However, I can receive calls, as well as send and receive messages. Also there is this 'E' that I can now see on the top bar. PLease help me out. PLEASe

Thanks in advance!