Starting Friday, customers will be able to sign up for Sprint's new Family Share Pack. This shared data plan offers 20GB of data - twice as much as AT&T, T-Mobile and Verizon - for up to 10 lines for just $100 per month. And as an added bonus, Sprint is throwing in an extra 2GB per line for a limited time.

Assuming you sign up with 10 lines, that's just $10 per month per line, each with 4GB of data and unlimited talk and text. Sprint is also offering up to $350 to entice families to break their existing contracts, a move popularized by rival T-Mobile not all that long ago. It certainly sounds like a great deal but there are a wealth of conditions that must be met in order to get the best pricing.

By reading the fine print, we learn that the $100 per month offer is only available from August 22 through September 30, 2014. What's more, it only applies to customers switching to Sprint from a competing carrier. Additionally, all devices must be purchased through Sprint Easy Pay to qualify. Even if you do meet all of the above mentioned criteria, the $100 rate will expire at the end of 2015 at which time customers will be charged an access fee of $15 per month, per line. Ouch. Sprint promises more news is coming later this week regarding changes to plans for individuals.