Hello Insano! You're right, you can say: I've missed 2 calls; or I missed 2 calls. Your options include you think the "missed" is important for me the listener, so use present perfect you think the "missed" is very recent, not PAST but BEFORE NOW, so use the present perfect you think the "missed" is not so important for the listener, maybe for you, but not the listener.
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insanoIs the Past Simple incorrect here?No. Both are possible.