This is a new call package from glo. Details were were sent to me via twitter, so I'm sharing it here.
@GlobacomLimited: Gbam Xtra: Glo 11k/s plan:

It is a an exciting prepaid plan offering the best calling rates to customers with very attractive calling rates of 11K/s to ALL networks and 20K/s to popular international destinations.

Rental fee of N5 is only charged on your first voice call of the day. The rent will not be charged if you don’t make a call. The daily rental fee of N5 will be charged on the first call of the day irrespective of the destination of the call.

To migrate: Dial *100*6*1# and when asked for the confirmation press 1

Onnet call rate:11K/s

Offnet call rate:11K/s

International calls to popular destinations-USA, UK landlines, Canada, China and India: 20K/s

On-net SMS: N4/SMS

Off-net SMS: N4/SMS

International: N10/SMS