Hi Guys from my research, check out the misguiding aid by Etisalat that is circulating Town. I currently use two of the other networks and they offer additional 500% value of all recharges. 
Shine your eyes and don’t dull yourself with this people’s Media ad

• How can Etisalat 250% equal 500% airtel value?
• MTN 500% value of N400 gives N2400 and not N2000. Also you get 59.7mins not 50mins
 Do your own checks and don’t be fooled by Etisalat.