I wonder what is the use case for those apps?

hi to all steemians friends.this the second part of my journey i am a seller of sim cards tnt smart tm globe.i need so that i have income if no one will buy to me.i fill sorry to myself.but not at everytime

A lot of people ask me for recommendations for staying connected while traveling internationally. T-Mobile is the best service for international roaming, but the service here in rural Oklahoma is pretty