I think for singtel users, the most common plan will be 2 year
plan. but than, they will let you recontract at 1 year, 21 months
or 2 year respectively.
At which period should you recontract to maximise your gain?
let's just imagine you are planning to use singtel for 14 years
for this exercise, so can compare with this 3 period of
recontract.
