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With this plan and your Mobile Broadband Card or USB modem, you have instant Internet access wherever you go on the Sprint Mobile Broadband network.
This plan includes

• 5 GB/mo. in total or 300 MB/mo. while off-network roaming. (1024 kb=1MB. 1024 MB=1 GB)
• Additional monthly usage over 5 GB costs 5¢/MB. You may not use more than 300 MB/mo. while off-network roaming.
• International data roaming may incur additional charges.
• Sprint reserves the right to limit throughput speeds or amount of data transferred.
• Learn more about what's included in this plan

$49.99 5GB Mobile Broadband Connection Plan - 3G/4G

Get the best of both worlds: Take advantage of turbo-charged unlimited 4G Internet access in the Baltimore area and 5GB of 3G coverage nationwide. Important coverage and plan information.
This plan includes

• An unlimited 4G connection in Baltimore that can keep up with you. Download mammoth files, watch streaming videos and video conferencing without the lag. More coverage locations coming soon!
• 3G coverage nationwide: 5GB/mo. in total or 300 MB/mo. while off-network roaming. Additional monthly usage over 5GB costs 5¢/MB. You may not use more than 300 MB/mo. while off-network roaming. You can check your usage online anytime. Log into www.sprint.com/mysprint and click on usage details.
• International data roaming may incur additional charges.
• Sprint reserves the right to limit throughput speeds or amount of data transferred.

$79.99 4G: Unlimited/3G: 5GB
Features included in all voice plans.

I'm sure the unlimited has to do w/ it, but it is possible that they'll try to charge more for the faster internet.