All the network in Nigeria, MTN, Glo, Etisalat and Airtel have double data bonus but some are based on eligibility while some are not. Double data bonus means the subscriber will be given multiple of the data he subscribed for. If he purchases a data bundle of 1.5gb, he will be given 3gb. Let me start with MTN
All MTN sims are eligible for MTN double data bonus. I have made a post about it. Read it Here
Etisalat double data bonus is available only on 9mobile more Clique SIMs. First, Migrate to More Cliq by dialing *200*2*2#. To activate the double data dial *545*3*1#.
After that you can go ahead and subscribe for your desired bundle plan.
9mobile double data bonus is applicable to bundle data between 40mb to 500mb. Any data bundle above 500mb will not be entitled to the double data bonus
Glo double data bonus works on all Glo sims irrespective of the tariff plan. You only need to allow Auto renewal for you to enjoy the double data bonus. Example, If you purchase a monthly bundle data of N1,000, You will be given 1.6gb. Then you will allow Auto renewal for the bundle. When the data expires and you recharge N1,000, it will renew itself automatically and you will be given the double data which is 3.2gb
Not all Airtel SIMs are eligible for the double data bonus. This means that Airtel double data bonus works on selected SIMs. You can read more about it Here
Any question? Comment box is there