I have a 4G xoom and a Samsung charge with unlimited data and xoom has 2g data. Just swaped sim cards and worked fine on my phone it showed 2g data and could surf the internet and market fine just could not call or text. In one of the 4G manules that came with the xoom it says that your 4G sim card can be use with any 4G Verizon certified device and will be billed for whats on your plan.
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Sent from my Super charged using DroidForums