Sprint[1] has extended its BYOD (bring your own device) deal[2], so you can still switch to Sprint with your current device and get an entire year of service for free.

More than a year ago, Sprint[3] began offering this incentive as a limited-time offer. But it's still available, and it really is as good as it sounds. There are no hidden catches. To help you understand how it works, we've combed through the details and explained it all below.

Also: Sprint gets even cheaper with $15 unlimited data plan[4] CNET | Why a pair-up between T-Mobile and Sprint could improve IoT and mobile worker plans TechRepublic[5]

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(Image: Sprint)

How to get a free year of unlimited service with Sprint

Is your phone compatible?

Check to make sure your current phone is unlocked and supports Sprint's CDMA bands. Find your devices's IMEI or MEID and enter it on Sprint's site here[6] to see if it's eligible.

Do you love your current number?

With Sprint's BYOD deal, you get to keep you current phone number.

Actually, it's a requirement. You can't set up a new line of service. You must port your number from an active service elsewhere -- like AT&T[7], T-Mobile[8], or Verizon[9]. Chances are, you can port from a smaller carrier, too (like Cricket Wireless[10], even though it's an AT&T MVNO). Again, just plug in your device's IMEI number here[11] to confirm it is eligible.

If you don't have an existing number, CNET[12] noted there may be a workaround if you

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