International Dialing Codes For Travelers all over the world, a friend of mine was in a city abroad he chatted me up on whatsapp just saying he had missed his way back to the hotel he was staying in I was surprised, the first thing I asked hm to do was to call the hotel telephone number. And he said he has tried it several time on his raoming Nigeria sim card but not reachable.
SOURCE: https://www.travellersguide.com.ng/international-dialing-codes-for-travelers/
