The Chilean postal service is very efficient and has offices all over the country. The main post office is located on Plaza de Armas (main square) and opens Monday through Friday from 8.30am to 7pm and Saturdays from 8.30am to 3pm. To find out the nearest post office to you call
The code for Chile is 56 and for Santiago 2. If you want to call a mobile phone you must place before the number a 09 from a normal phone and 9 from another mobile phone.
There is internet available almost everywhere, at hotels and shopping malls, plenty of ciber cafes all through Santiago and the regions.