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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The amount of data travelers need may vary depending on the tasks they do and the length of their trip. For most travelers, 500MB to 1GB per day is good enough to do the core tasks.
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)