For most trips, 3GB or 5GB of data will be enough to cover common internet usage. However, if you plan on using the internet more or traveling for a month or longer, you might want to consider cards with up to 7GB of data.
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Activities that use a lot of dataHigh definition video streaming (900MB per hour) Video conferencing, like FaceTime® and Skype® (480MB per hour) Standard-definition video streaming (240MB per hour) Online interactive gaming (60MB per hour)