C500 won't turn on msn

Look on the upper Icon Bar.In the very center you should see an Icon indicating what data service your phone is connecting with. G for GPRS or E for EDGE, etc.

I assume you can make voice calls and SMS works? MSN is an IE internet email service. Check to see if you can browse the internet. If not, this may be a WAP network setup problem. Check with your carrier, or on google the internet on you PC for the correct data setting for your carrier. You SIM card has your carrier printed on it.