Airtel for a while have had some plans which gives double of what you subscribe for called 1+1, but the sad thing was not all SIM are eligible to subscribe to this plan.
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If you are eligible you get 4GB data for 15oo naira if not eligble you get just 2Gb for same price, so getting eligible was something everybody wanted.
How to get your Airtel SIM to be Eligible
1. Dial *440*440# and if it works for you then you will get a message that: “You are ELIGIBLE!Dial *440*161# for the Unlimited 1+1 offer at N1,500 to get 4GB valid for 60days or dial *141*1# for other BB1 + 1 offers“
2. If the first method doesnt work for you then the last resort which will always work is, to call customercare and tell them you want to enjoy the 1+1 plan and surely they will make your SIM eligible (i have done more than 4 SIM by calling them).
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How you can now enjoy the airtel 1+1 plan, to know more about the plan read here Airtel 4GB data plan for 2 months for 1500 naira is back
How do you check data balance on this plan
How can I subscribe for this? I am using Itel iNote Tablet