You're banned?

[jebem]

I misunderstood the question, sorry.

If i understand correctly, the only difference is on the client browser type used.
As far as i know, different browsers behave differently when negotiating the connection to a web server and the server itself recognizes the client device and browser and may issue a unique response based on that. Long shot yes but not impossible.

I am using chrome all the time on my LG smartphone and never had issues connecting from lisbon region.

Assuming that the chrome cache has been fully cleared and the issue remains, uninstalling it and installing from scratch may not hurt too much (saved urls are gone) and may fix the problem.

Edit:
While not very probable on smartphones, another possible cause would be a adware/virus that have compromised the browser application, in this case, Chrome. This is too common on Windows browsers to be ignored.
However, installing a anti-virus to scan the smartphone will not hurt either, and it can be uninstalled after doing the checking.