How many smart and unused devices do you have?

Question

Mobile devices

Greetings! I'm thinking about drafting a service that will be useful for people who often travel abroad. I want to calculate the statistics and see if I need to start at all, I hope you can help me with this :)
How many mobile smartphones do you have that are idle "lying on the shelf"? Do you often travel abroad? Do you use roaming or buy SIM from local operators and connect to the Internet?
Desired answer format:
2 devices (Android 2.2, Windows Mobile 6) - 2 times a month - I use roaming

Answer 1

(Android 4.2 smartphone, Android 5 tablet, iPod touch 4) I use roaming, I go abroad - once a year.

Answer 2

One Android mobile phone and one tablet.

Answer 3

I use all the devices all the time, I see no reason to buy devices in the race for new products ..