Leap Wireless’ Cricket is raising prices $5 a month on its prepaid 3G mobile broadband service for the second time in nearly a year, with the announcement the company will offer limited data roaming on Sprint’s 3G network.

In return for being able to access Cricket mobile broadband outside of the company’s highly limited network of cell towers, the price has to increase, according to statements made on Cricket’s website.  Cricket will now sell three different broadband plans, all without a contract:

$45/month for 2.5GB, $55/month for 5GB, or $65/month for 7.5GB

But there are a number of catches.

First, your service will be terminated if you do not live in a zip code where Cricket provides its own cellular service.  The company is only interested in selling service to customers who will primarily use it inside of its own coverage areas.  Second, if you are caught data roaming on Sprint’s network for more than 50 percent of your monthly usage, the company can throttle your speed to dial-up for at least one month or terminate your account.

These pricing changes could also impact certain grandfathered Cricket mobile broadband customers, some of whom are still paying Cricket’s rate of $40 a month for up to 5GB of usage that was being sold until last summer.  Who will pay the added $5 bite depends on when and where you activated your account:

Customers activated prior to August 2, 2010: You are likely grandfathered on Cricket’s $40 a month plan, good for up to 5GB of usage per month.  Most of these customers never activated last year’s newly introduced limited 3G mobile data roaming, so they will not be able to use their service outside of a Cricket service area.  They will not see a rate increase unless they opt-in to “roaming” service from a menu on their wireless device’s configuration panel.  If you opt in, you cannot opt back out.

Customers who purchased their device at Best Buy, Wal-Mart, or Radio Shack at any time: You are not eligible for 3G data roaming service at this time.  You will not see a rate change unless and until that changes.

Customers activated after August 3, 2010: Your device was activated with 3G roaming capability and you will be impacted by the price change.  Existing customers on an impacted account will receive Nationwide 3G coverage beginning July 12.  The first bill with increased pricing will be for customers with a bill due on August 11.  Your bill will see an increase on or after this date.  Technically that equals one month of free roaming coverage.

Cricket's new data coverage map, with Sprint roaming included.

For some customers, this is quite a price increase from two years ago when the company claimed to provide “unlimited” 3G wireless broadband service for $40 a month.  Customers soon learned Cricket’s definition of “unlimited” meant around 5GB of usage before the company throttled broadband speeds to near dial-up for the remainder of the billing month.  By last summer, “unlimited” was gone, replaced with usage allowances enforced by the aforementioned “fair access policy” speed throttles.

Although the company touts the service will run at speeds up to 1.4Mbps, in reality, most will see speeds much lower than that.  From Stop the Cap! headquarters in Rochester, N.Y., we routinely see speeds on Cricket’s 3G network operating at between 300-600kbps.

Cricket still delivers a cheaper plan over Sprint-owned Virgin Mobile, which charges $50 for 2.5GB.  For those who want more, Clearwire is still pitching 5GB of usage on Sprint’s 3G network and “unlimited” use on its 4G network, although “unlimited” really isn’t when the provider deems you a heavy user and throttles your speeds.  T-Mobile offers a data pass for some of their customers allowing 1GB of data for $30, 3GB of data for $50 — all prepaid.