Just saw this now on a facebook group and wish to share it with every one though I haven't tested it yet but from what I see from other peeps reply I think it works great
H0W TO EXTEND YOUR MTN BIS TO 6MONTHS
Reset date on Your Blackberry to 6months ahead any time You want to Subscribe for New BIS ..
then recharge N1,500 and
Subscribe for MTN MONTHLY BIS.
=> After that, remove Your
Blackberry. battery and insert again, set Your normal time and flex!!
My Friend is Making Cool cash From this lovely Tips by turning N1,700 to N4,000 on Every Sim...
You ask me How?? All he did is purchasing a new Sim Card @ the rate of N200 and buy MTN Airtime @ the rate of N1,500 making N1,700 then Follow above Tips and Sell the Sim to People that Need it