You pay by the minute. An ipad will pick up the signal--most of the time. It works somewhat better in the common areas of the ship. It's not very fast. I did not think it was that good for browsing. One trick is to connect, download all your emails, and open them off line You can do the same with emails you send-- type them, connect, and send them. Some of the ports will have wifi. Check the price and see if it's worth it to you.
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