This plan has been around now for a while and a lot of Nigerian still don’t know how to subscribe for this plan. According to MTN, you get a whooping 500MB for just N25. Imagine, getting 500MB for just N25 at a time when 1.5GB cost N1000 for most network in Nigeria.Although, every sim card is entitled to just 500MB per night at a rate of N25, you can get up to 4GB if you have up to Eight sim card. All you have to do, is activate the plan on all four sim card. It is best to note that this plan is only usable between the hours of 12am – 4am.How To Get MTN 500MB for N25
» Migrate to MTNPulse tariff plan, by dialing *406#
» Make sure you have a minimum of N30 in your phone
» Send NIGHT to 131 via SMS and you’ll get a message like this

“Dear customer, you have successfully subscribed to Free Night Browsing between 00:00 and 04:00. N25 has been deducted from your account.”
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http://www.ttechbay.com/2018/06/08/enjoy-mtn-4gb-data-plan-for-as-low-as-n200-only-and-8gb-for-just-n400/

So we shouldn't enjoy our sleep again all coz of mtn fake 500mb sub.