Cradlepoint MBR1200B

This device solve your problem .  You can use your mobile hotspot to provide internet access to this device and access internet to your wired devices.  It helpful for small business or home users.

The Cradlepoint MBR1200B provides wired Ethernet, and 3G/4G wireless WAN connectivity to keep you and your business up and running.

Benefits:

• Use as primary connection to the Internet with wired or wireless broadband.
• Ensure against loss of productivity and business opportunity with automatic failover to 3G/4G when the wired connection is disrupted.
• Load balance across the multiple wired and/or wireless connections when additional bandwidth is required.

https://cradlepoint.com/products/mbr1200b#!desc