How to get over ₦3500 for free on Airtel

I do not know if it another glitch on the Airtel network but there is now a method of getting over  ₦3500 for free on the network. Here are the procedures:

1. Dial *447#, and then call any network for at least 2 minutes.
2. Then dial *446# and you will be automatically credited with  ₦3869 valid for Airtel-Airtel lines only.

You can use *123*9# 2 to check your remaining balance.

I think it's a glitch so you should probably use it while its still hot.