If you want to buy Motorola's Xoom tablet, I strongly suggest you read up on which mobile networks provide network access - and whether or not it is 3G or 4G lte.
The Xoom's MicroSD card is non-operational at the moment. Apparently, it will be able to use the MicroSD after a software upgrade allows it to do so.
The information below was taken from Motorola's website.
Here is the URL to the web page for you:
https://motorola-global-portal.custhelp.com/app/answers/detail/a_id/62461/~/motorola-xoom---troubleshooting-tips
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Motorola XOOM - Using Non Verizon SIM
Can I use a Non-Verizon SIM card with the Motorola XOOM?
No, you cannot use a Non-Verizon SIM card with the Motorola XOOM. The SIM tray supports only Verizon 4G LTE SIM and requires an upgrade to 4G LTE service. A dummy SIM card is included at launch and will not affect tablet performance. You will receive a Verizon 4G SIM card when 4G LTE service is available.