Sprint, the fourth largest U.S. wireless carrier, has come up with a spectacular plan that may give its rivals tough competition.

In efforts to attract customers, Sprint is all set to offer unlimited data plans for five lines at $90 per month.

The offer from Sprint is a limited period one and comes soon after rival T-Mobile launched its One Plan, which started at $70 for a single line. The latter's subscribers can also avail four lines for just $160, which is inclusive of fees and taxes.

Sprint announced its new plan on Feb. 10 and it will entitle the carrier's subscribers to plenty of benefits. From Feb. 10, customers will be able to take advantage of the limited period offer.

"Sprint understands the value of unlimited data to our customers. Customers do more with their phones every day and they want to use them without limits. With our new offer, you can sign up for a plan that allows you to surf and stream all you want and not worry about overage fees and charges," said Roger Solé, the carrier's chief marketing officer.

Sprint's Unlimited Plan: How It Works

To avail of the five lines for $90 offer from Sprint, those interested have to first sign up for the Unlimited Data, Talk and Text plan with the carrier by using AutoPay.

This will entitle the subscriber to get the first line for just $50 each month. By adding the second line for a family member or friend, one will simply need to pay $90 each month, which works out to $45 per line.

If the subscriber wants to add more users to the Sprint plan like loved ones or children, they will get the third, fourth and fifth line free of charge.

Any Caveats?

The promotional scheme introduced by Sprint is strictly for new subscribers and not existing ones. With the latest plan, one can enjoy unlimited text, talk, and data for a nominal amount each month. The price, however, is not inclusive of any taxes and surcharges. After these, the plan works out to an additional $5 to $25 extra per month.

There is also an activation fee of $30 for each line. This works out to a one-time fee of $150 for all five lines.

Moreover, the fine print reveals that while subscribers will save till March 31, 2018, after this period, they will have to shell out different charges. The first line will set them back by $60 instead of $50 each month. The second line will cost $40 per month. The three additional lines will cost $30 each per month.

Moreover, the carrier asserts that data throttling could occur when there is "congestion."