Nighthawk MR1100

Hi.

My Nighthawk MR1100 is slower than my iPhone.

I have checked the APN settings match my provider.
The Band/channel when doings tests on iPhone and MR1100 are the same.
My iPhone achieved 90Mb/s down and the MR1100 achieves 6MB/s download.

I have tried attaching an antenna to the MR1100 and this improves it slightly to 10Mb/s

Can anyone explain why my iPhone is getting a better speed than this device?