HELP from the experts

If you get a 10GB mobile share plan from AT&T, it will be $100 + $15 (assuming you go with their NEXT plan) x 4 = $160 + tax for 10GB data and unlimited voice/text.

 

To build on this... You won't be able to keep your unlimited data if you switch carriers.

You may also want to consider buying your 5c phones used or bumping up to 5s. The reason is that with AT&T Next, you'll still be paying the full retail price of each phone. A 5c will cost $450, a 5s would cost $550, a 6 would cost $650, and a 6+ would cost $750.

If you're planning to keep the phones for 2 years each, you would do the AT&T Next 18 plan for cheaper monthly payments.

Assuming the base models and a sales tax of 8.25%:

- iPhone 5c = $38.25 up front + $18.75/mo for 2 years
- iPhone 5s = $46.75 up front + $22.92/mo for 2 years
- iPhone 6 = $55.25 up front + $27.08/mo for 2 years
- iPhone 6+ = $63.75 up front + $31.25/mo for 2 years

To put it all together, if you switched to AT&T and got the 10GB plan with the 4 phones you originally wanted (2 5c, 1 6, 1 6+), you would pay $195.50 up front for the devices, $160/mo + tax for the plan, and $95.83/mo for the device payments.

Over two years, that puts you at $195.50 + $3840 + $2299.92 = $6335.42 + service taxes/fees and leaves you owning all 4 phones.