ATT, Grandfathered plan, 5 lines, 700min
$60 for the service
$40 for $10x4 additional phones
$30 unlimited sms/texting for all lines (free mms for the data plan phones, others get charged if they get mms)
$20 for data unlimited for 2 'non-smartphones' (they are actually smartphones using EDGE, no 3g, it's a loophole)
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$26 for the people without data plan
$36 for the people with a data plan
After taxes, runs around ~$28/$38 per person per line per month. The people on our plan aren't blabbers, so it is easy to keep within the means every bill.
If we wanted 3G service, two smartphone users have to front $15 more each for a total of ~$52. Not worth it to me.