2/ You put the envelop in the mailbox
Even a young kid, or a tourist or new immigrant from another language country, can write a Phoneposte envelope and insert it in a letterbox!
Phoneposte uses the universal language of numbers: all inhabitants of the planet know the same numbers!
At the beginning of our century, everyone is used to mobile phone numbers and memorizes his correspondents numbers but not…. their postal addresses…!
What about you?
See the next step :