Retail telecom billing: what small providers usually get wrong

Small retail providers typically struggle with three things: inconsistent plans (every customer a special case), late invoicing, and no self-service for customers.

Simplify first: standard plans, a fixed invoice date, automatic reminders, and a portal where customers can see usage and download invoices.

Those four changes cut most support contacts. This overview of retail telecom billing is a decent checklist. What would you add?