Given a travel related situation, and given a specific question about the situation, summarize the question into a title

Example input: The green carriage is of course first class. This would be our first preference with our 5 month old baby in lap, because of the presumably larger toilets for changing and whatnot. However, the baby being a Western white baby... will occasionally babble, screech or cry uncontrollably for a little while.

Speaking in terms of Japanese culture, should we avoid Green class tickets if we are taking aboard a potentially disruptive baby?

Example output: Japanese train etiquette: Is it acceptable to take a baby in the Shinkansen Green Car?
Example explanation: A person gives a detailed description about a situation where they would prefer to travel on the Shinkansen Green Car but is doubtful if doing that would be against the Japanese train etiquette since they will be traveling with a baby. The question is summarized as Japanese train etiquette: Is it acceptable to take a baby in the Shinkansen Green Car? for easy indexing the next time someone searches for a similar phrase
Q: I have recently traveled to Lisbon and almost each day while being there I have received the same message thorough a cell-broadcast channel on my mobile phone:

21 Lisboa

I have asked my host, but she did not know what this message meant. I am thinking it might be related some weather warnings, but the worst thing I have endured was a light rain.

Question: What does "21 Lisboa" cell broadcast message mean?

A:
What does "21 Lisboa" cell broadcast message mean?