Phoenix let me know about this new application from Turner Technologies called David. It lets you monitor your minutes, text messages, and data usage from an app on your phone. It has a 2 month free trial after which you can purchase the application for $3.99. I cannot promise how well it works but since MiniMon stopped working with OS 4.5+ this is the only solution I have found.
Features include:
- Daytime, Evening, Weekend & Long Distance Minutes Monitor
- Data Transfer Monitor
- Incoming, Outgoing & Long Distance Text Messages Monitor
- Alerting (visual alert when usage approaches 85% of wireless plan)
- Real Time Bill (displays your wireless bill with real time values)
- Bill History (View bills from previous billing periods for your records)
- Dynamic Free Updates
Check it out at this link
David – A Cheap Wireless Data, SMS, & Minutes Usage Monitoring