Communications in the United States

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Official Language
Other Languages Spoken
Spanish, in particular in Arizona, Texas, California and New Mexico. Other languages, such as Amerindian languages (Navajo, Hopi, etc.) and also Chinese, Japanese, Italian, German, Polish, Greek, etc. depending on the community of immigrants.
Business Language
Getting Some Knowledge
English as a Second Language (ESL) program offered by Universities or private schools. Foreigners can take English classes at different levels and improve their writing and speaking skills in English.
Free Translation Tools
Cambridge Dictionaries : Online Dictionary

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Quality of Communications
The USA has one of the most developed network systems. Competition in the telecom market has become a race to be chosen by the customer to deliver bundled communication services, including voice, wireless, data, TV and cellular. In this infrastructure-based competition, Cable TV is in the lead.
Telephone Codes
To Make a Call From the United States, Dial 011
To Make a Call to in the United States, Dial +1 (except Canada and the Caribbean).
Number of Digits of National Telephone Numbers
See here the detailed list of US regional codes.
Mobile Telephone Standards
The US mainly  uses Analog, TDMA, CDMA, GSM 1900. Also note that each standard may have multiple frequencies. Some phones can work in the US since the phone can support multiple GSM frequencies. 
Another way to use a cell phone in the USA without subscription is to buy pre-paid cards.
National Mobile Phone Operators
AT&T, T-Mobile, Verizon, SBC, BellSouth, Sprint, Qwest

Availability of Internet

Internet Suffix
National Internet Access Providers
Comcast, Earthline, Aol.
Access in Public Places
Accessible in a lot of places: Free wifi point access in different places in big cities.
Access in Hotels
Accessible in most hotels

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