You can call anywhere in the world - however you can request to have anything blocked text message/data/LD/voice. To my knowledge you have an international roaming block - not an automatic LD block. You can call Mexico, the UK, Hong Kong etc. If you travel there your phone will not work unless you request the oversea's block to be removed. Upon returning you can have it placed back on your account by requesting it. Ignorance is not an excuse - I get a lot of people requesting data to be credited back because they didn't know it wasn't free or lent their phone to a friend and they used the data. It is your phone and financially impacting - use it with care.
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