The main language spoken in Argentina is Spanish.
The local currency is Argentine pesos (ARP).
$100 bills must be 2003 or later, or they will not be accepted. For travellers cheques, there is often a $1/cheque fee, and the exchange rate is better for $100 cheques. It helps to bring smaller bills as change is not always available.
To dial internationally from Argentina, dial: 000 + area code + telephone number. Hotel receptionists will help you make calls.
When calling Argentina, you must dial the country code of 54.
Only global cell phones will work and only in the bigger towns. You may want to consider renting one or getting a satellite phone.
Argentina uses 220 volt current with a European or Australian plug.