If you are arriving from a country with a Cape Verde embassy, you are required to purchase a Visa in advance. Otherwise a visa can be purchased on arrival and costs ~25€.
The Cape Verde Bureau Cape Verde Consul in Liverpool, England provides travel visas for travellers from the UK and Ireland.
Cape Verde has an embassy in Lisbon, Portugal. (http://www.embcv.pt/lista...)
Cape Verde has an embassy in Brussels, Belgium.
Cape Verde has an embassy in Geneva, Switzerland.
Cape Verde has a consulate in Rotterdam (http://www.conscv.nl/serv...), The Netherlands.
Cape Verde has an embassy in Washington, D.C., USA
Cape Verde has a consulate in Moscow, Russia. (http://cv-consul.ru/en_vi...)
Cape Verde has an embassy in Brasília, Brazil. (http://www.embcv.org.br/p...)
Cape Verde has a consulate in Vienna, Austria. (http://www.konsulat-kapve...)
Cape Verde has an embassy in New Delhi India : 6/24 shanti niketan, new delhi
The telephone system is effective and improving. There is mobile phone coverage in all cities and most towns. Check with your provider as to the roaming costs.
Consider whether a local SIM-Card is benifical for you because of exorbitant roaming costs.
The country also has Internet service provider.
You will be friendly helped to prepaire you device for telephone and internet in the telephone shop.
Perhaps helpful in German: (http://www.kapverden.de/f...)
Some hotels offer WLAN.
The official language is Portuguese, used in all official publications and announcements as well as in business, media and schools, but the local language is Cape Verdean Creole Kriolu kabuverdianu, a Portuguese-based creole language with 95% of the words from Portuguese and the rest mainly from West African languages. It is divided into 9 dialects spoken on various parts of the country. Even though Kriolu is comprehensible to a skilled Portuguese-speaker almost all people can also speak Portuguese as a second language. French is also known by many, and some people also speak English; basically, Kriolu is your first option, Portuguese second, French third, English fourth.
It is a good idea to know some Kriolu or at least Portuguese, since even though young urban people are often quite proficient in English, this does not apply to old and rural people, and even those who can speak English will highly appreciate any attempt you do to speak Kriolu or Portuguese.