"Lack of device subsidies and customer care makes for healthy margins, though ARPU can be as low as $1 a month...
Nearly all cellcos are talking about new revenue streams based on machine-to-machine (M2M) services, but few are certain of how the charging and ARPU will work out. Sprint has shone some light on that issue, claiming its M2M unit is generating ARPU of between $5 and $10 a month, and a very high profit margin."
