The carrier war continues to heat up, as T-Mobile has confirmed that its Jump plans are about to see some critical changes.

T-Mobile Jump customers will now be able to upgrade as many times and as often as they want, with no limits or waiting periods.

Jump users who have already paid off half of their devices' value will be able to upgrade for free. Those who haven't will need to pay off half their devices' total cost in order to upgrade.

T-Mobile's Jump plans will also include tablets, and these changes go into effect February 23.

For the better

Previously T-Mobile Jump plans required subscribers to wait six months after signing up to be eligible for their first upgrade, then a further six months in between upgrades.

The Jump program still costs $10 per month in addition to customers' normal subscription fees.

These changes were first reported as a rumor by TmoNews, but the carrier soon confirmed them with Fierce Wireless.

The carrier war continues

The Jump improvements are T-Mobile's latest tactic in the ongoing war between the big four US carriers (T-Mobile, AT&T, Verizon and Sprint). But unlike most wars, the battle between carriers usually benefits smartphone users.

Previously, T-Mobile offered to pay off contract termination fees with other carriers if they switch to T-Mobile and trade in a device.

Verizon, meanwhile, just introduced new "More Everything" plans to replace its "Share Everything" plans.

In January Sprint introduced new "Framily" plans and changed its "One Up" upgrade program into the superior "Easy Pay."

And AT&T began offering new Mobile Share Value plans in December.