This magnetic band cards are used in Bogota, they have a magnetic band to be slipped thru or inserted inside the phone to enable the calls.

This is the info on the back of the card:

"From ETB public phones: Take the handset, insert and remove the card or slide it and follow the instructions. If you want to use the PIN code, press the ETB key and follow instructions".

$ 1.000

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$ 10.000

Similar back for all this cards