How To Borrow Airtime From MTN, Airtel, Glo & Etisalat

These are the shortcodes to use when you want to borrow airtime from any of the networks listed below:
NOTE that the this attracts a service charge of 10% of the airtime borrowed.

MTN - *606#

Airtel - *500*Amount#

Glo - *321*Amount#

Etisalat - *665*Amount#