You going on your own with an iPhone 5, 4GB/month:
$200-$300-$400 for the subsidized hardware
Monthly:
$70 for the 4GB per month, plus unlimited voice
$40 for the privilege of downloading them via the shiny iPhone 5
=$110x24=2640 for the length of the contract
5 women or men going at it together:
$200-$300-$400 for the subsidized hardware
Monthly:
$150 for 20GB per month, plus unlimited voice
$40x5 for the privilege of downloading them via 5 iPhone 5
=$350x24=8400 for the length of the contract, or $1680
Or $350/5=$70 per individual, monthly
Group buy would net $960 savings for each individual for the length of the contract, or $40/month. Another way of looking at it: $110/month is 57% higher than $70/month.
Are there any mistakes in my calculation?