iBook computers can use 110 V and 220 V power. If the power in the country you are traveling to is different from your home country's, you need a power cord adapter. You can purchase one at an electronics or travel retailer. Review the following Knowledge Base article for more details:
Article 129: "
World Power Differences Can Limit International Product Use."
Most modems are not certified for use in other countries. It is best to use an external USB modem that complies with the regulations of the country you are travelling to.