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1. ETISALAT 1gigabyte for 1000naira dial *229*2*7#
2. AIRTEL 1gigabyte for 1000 naira dial *141*1# then press respond with 3 to select android subscription
3. AIRTEL 2.5gigabyte for 1500naira dial *440*16#
4. Glo 1.5 gigabyte for 1000 naira dial *777#
enter 1, after that choose 1 again, then press 2, and
lastly, choose 1. You can check the options as you select
them, they should be directing you to monthly subscription
then 1.5 gig for 1000 naira