There are plenty of reasons to pick up a microSD card, should your phone support one. It can be a lot cheaper to get a phone with less storage and plan to add more. Media maniacs and data hoarders can also make use of the super cheap extra space. But if you think SanDisk's new A1 and A2-rated microSD cards are going to provide anywhere near the experience of your phone's built-in storage, think again.

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