Buenos Aires It is the main city that Brazilians visit abroad, not only because of the proximity to our country but also because of the incredible variety of things to see / do.
Let's go?
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Transport
As it became a tradition, we will start with the transport. To use the subway, bus or train, you must purchase a card called SUBE, refillable, which will make your life in the capital of Argentina easier (and more). The card can be purchased at hundreds of locations if you prefer, the SUBE office is located at the following address: Callao 316 (10 am to 8 pm).

If you are not going to use a bus, the metro accepts Argentine pesos and you will have no trouble buying tickets for one, two or as many trips as you want. If you need to use the collectives service in the city, it complicates things a little, since you need coins, something that apparently is extinct in the country herman.

If your choice is taxi, there are apps just like in our country. Payments can be made via credit card, Argentine peso, US dollar and even real. But beware: not all taxis do this currency conversion, so ask before entering and ask to use the meter (seriously!).

Currency and exchange
As there is a restriction on the sale of dollars in Argentina, there is an “black exchange” asset, with a good price for exchanging dollars for pesos. I do not recommend this practice, especially since it is an illegal and risky transaction, which can turn a fun or romantic outing into a police case. The counterfeiting of coins in the country is somewhat frightening and must be observed very carefully.
To convert, I recommend the following app:

Do not exchange money with strangers on the street, change your money at exchange offices or banks, located throughout the city and also at the two airports (Ezeiza and Aeroparque). If you wish to carry pesos from Brazil, not all exchange houses that operate with the Argentine currency.
Telephony and Wi-Fi
As in most of the world, Argentina has 4G services, and the largest operators are Movistar and Claro. Having mobile internet on your cell phone is very cool, especially if you enjoy exploring the city and don't want to be restricted to places with Wi-Fi.
If I can indicate one of the two operators, my choice would be Movistar, with its promotions on certain days of the week, which offer double or triple credits, in addition to having the best service in the country (according to the Argentines themselves).

Movistar's 3G plan gives you the right to use a daily allowance of an incredible 10MB for 7 days, for 12.90 pesos. Exceeded this limit, each 15MB costs an additional 3.30 pesos. The chip comes out for another 40 pesos.
If you prefer to stay on Wi-Fi networks, I recommend this app:

Several squares, shopping malls, stations, restaurants, etc. have free internet, making it a great option for those who do not want to venture into Argentine telephony.
Restaurants
Sorry, app not found.
Restaurant guide.
Culture
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Cultural program guide.
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Abaporu, one of the attractions MALBA.
Bike
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Bike paths and bicycle rentals.
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To find the attractions, in addition to Maps or Google Maps, I continue to recommend Triposo's excellent line of applications:

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I hope you liked the tips. Have a good trip and see you next time!
PS: If you are scheduled to visit Orlando, Rome, Paris, New York or San Francisco, check out other app tips from this series of mine Traveling with your iGadget!