Calculate a true potential ROI. Determining ROI for a mobile solution can be tricky because some of the returns are hard to quantify. Some of the most notable are hardware ($3,000 for a durable mobile computer with a three-year life expectancy), monthly subscription and hosting fees (which can range from tens of dollars to $100 per unit), accessories (up to $200 per device), a data plan (about $50 per month, per unit), and support personnel.