Llamadas: mobile+human pay phone
One of the most interesting service you find on the street in Peru (and I am sure you can also get it in other countries) is the "llamadas". It's generally women or teenagers with a bundle of mobile phones and a stop-watch who act as pay phones. They wear colorful clothes with mobile carriers brands and the "llamadas" logo (that they also shout when you pass by).
In the example below taken in the village Ayaviri, you can see a local coming with the phone numbers written on her notepad to ask the llamadas to call it. They are ubiquitous in city centers, often found near the Plaza de Armas.
A sort of mobile human phone booth in a sense, a proxy for your call.