How much would an AT&T Family iPhone plan cost?

AT&T, washington state
how much would it cost (DISREGARDING THE COST OF THE IPHONE BY ITSELF) for a family plan of:
4 iPhones
unlimited data
unlimited texting
unlimited minutes

would it be more or less expensive if we had the following plan:
3 iphones with unlimited data
1 regular phone with no data
all 4 phones would have unlimited texting and minutes.

Starting out here, AT&T charges $120 a month for two lines for unlimited calling, and $50 a month for each additional line up to 5 lines total.

That would make the talk portion of the bill $220, and that is not including text or data, yet. Unlimited texting for all lines on the account is $30, or $20 per line if done individually.

Data costs depend on if you want to share a pool of data or not. There are three choices for smartphone data if you want:

3 GB /month for $30 a month (for one line only)
5 GB /month for $50 a month (for one line only)
300MB/month for $20 a month (for one line only)

Unless you do very light browsing away from a Wi-Fi point, the 300 MB data plan is too little for a smartphone like the iPhone.

Assuming you had 4 iPhones, and wanted 3GB each, that would add $120 to the bill a month ($90 if you went with 3 iPhones and no data for the 4th line. )

For 4 iPhones the pre-tax total thus far is $370 a month, $340 for 3 iPhones, with the individual data plans.

Now, I will delve into their shared data plans:

AT&T's mobile share is a bit different in how it is set up.

The cost per line varies with the amount of data selected.

For 4 smartphones with 10 GB of shared data, the monthly pre-tax cost would be $240, for unlimuted talk and text with the shared pool of data.

If you were to just have three smartphones and one basic phone, the cost would indeed go down, but by how much depends on what data bucket you select.

Attached is a link to AT&T's mobile share page.

Keep in mind that there will be taxes and fees that will add between 5% and 30% to the bill, such as local and state sales taxes, E911 fees, and that lovely USF fee that gives away phones to people that often do not need them.