In late August, AT&T is introducing Mobile Share plans that let subscribers connect up to ten devices to a pooled data plan. Phones that are connected get unlimited calling and texting, and a set amount of data allowance is shared among the devices. Here's a brief look at prices and a breakdown of which plans are best suited to various types of users.

The base cost of a Mobile Share plan is for a monthly data allowance and one smartphone with unlimited calling and texting:

— 1 gigabyte $85 (each additional smartphone: $45)

— 4 gigabytes $110 (each additional smartphone: $40)

— 6 gigabytes $125 (each additional smartphone: $35)

— 10 gigabytes $150 (each additional smartphone: $30)

— 15 gigabytes $190 (each additional smartphone: $30)

— 20 gigabytes $230 (each additional smartphone: $30)

Subscribers can then add smartphones at the price above.

They can also add:

— Basic, non-smartphones for $30 each

— Laptops or laptop modems for $20 each

— Tablets and gaming devices for $10 each

The devices all share the same "bucket" of gigabytes.

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Here's how the Mobile Share plan stacks up against some current AT&T plans.

— The Connected Single: One smartphone with unlimited calling and texting.

Current Nation single-line plan with 3 gigabytes of data: $120 per month

Mobile Share with 4 gigabytes of data: $110 per month

Winner: Mobile Share. It's cheaper, and you get more data. Not many people need unlimited calling, though.

— The Frugal but Connected Single: The cheapest plans for that one-smartphone guy or gal.

Current Nation plan: $60 for one smartphone with 450 minutes of calling, pay-per-use text messaging and 300 gigabytes of data.

Mobile Share: $85 for one smartphone with unlimited calling, unlimited messages and 1 gigabyte of data

Winner: Nation plan. It's cheaper, but you get less, too. Continued...