SOURCE: My droid 2 global will
This is probably because your phone is locked by your carrier or it could be because different countries uses different standards. If you know that it should work, contact you carrier (E.g ATT) and see if you can have them unlock your phone for a small fee - which then should make it able for you to use the foreign SIM-cards you like to.
Good luck! And please if you do find this answer helpful give it thumbs up :)
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