Is there a 4G modem/router you can use with a MetroPCS sim card to have unlimited 4G data on your network?

[Speedlitz]

I'd prefer it to have at least one ethernet port so I can use my existing router, and maintain the same network setup, and just use this to get an internet connection.

 

[Someone Somewhere]

I'm a little confused by what you're asking for.

No mobile operator is likely to give you unlimited data - a few used to have unlimited plans, but they're not available any more because they got abused. This isn't a matter of the router or modem; it's the cellphone company's billing systems.

Why exactly do you want this?