asterisk users - Sep 2007 - Looking for a reliable source for DIDs from Mexico, Colombia and Venezuela

Hi!
I am looking for a reliable source of mexican (DF) and colombian DIDs.
I don?t need a lot of numbers, just 2 of each location.

In normal conditions I would simply go Inphonex, DIDX or voxbone.
But recently bought a DID from Peru and noticed that it could accept calls
from
foreign lines and cellphones, but no from local landlines.

I am worried if the same situation would occur with similar services of
other
countries where local telephone companies does not like competition.
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