If you compare i$Phone then be sure you compare with 6 or 6s model, all newer have bigger category then r11e-LTE6.
The case similar to you should be: http://forum.mikrotik.com/t/rbm33g-slow-bandwidth-help/137603/1 .
Please check post with images .
You should check at what bands works your phone, what CA, what signal-s. Then you can compare those devices.