My Bill is not what I expected
If you believe your bill is higher than what you expected, there could be several reasons.
1st Bill: Please note that your first bill may be higher than expected as you pay a month in advance.
Roaming: Did you go overseas? Are there any roaming charges?
Changed Price Plan: Have you changed price plan recently? If so you may have an advance payment for the following month on the new plan.
All yours? Make sure you check that all calls made on your bill, were from you or that you knew about.