If you are using the ATT blackberry email account, no you will not have access to it. That is carrier specific and cannot be transferred. For your other accounts, you will need to set them up in the BIS account for whichever cell carrier you select. You will need to make sure they offer BB data plans however.
As for recommending one, I suggest you try to Google cell carriers in the Philippines and select one that will have the coverage where you will need it - where you will live, travel, work and play.
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