How to check remaining prepaid data on MTN?

[Gaynor]

There is an MTN app you can download for smartphones which shows it. It took me a long time to discover this.

[benza2]

In case someone still wants a solution to the questions up to 2016 on how to get data available from MTN for prepaid SIM in router :
If you are within WiFi reach of the router:
1) Use a smartphone to connect via WiFi to the router
2) Install an app to be able to send USSD code - I use "emDial" (free app) on a Windows Lumia phone
3) Use emDial (or equivalent) to send USSD code - for MTN *141*1# , wait for MTN response and then reply with "2" to get list of data types and expiry dates.
Hope it helps!

[Houses4Rent]

How come purchased data/airtime can expire? is it going off or something like that? I never solved that miracle.