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Turn off LTE on the general->cellular setting and you should start using your microcell again.
 
Disabled LTE and now just says 4G.

Went and stood right beside the M-Cell, usually my phone has all 5 bars when next to the modem but just showing one 4g bar.

Guess next step is to speak to the admin once he gets in on Monday. This m-cell is shared at work but I don't have access to the device itself.
 
Having the same issue with my iPhone 4S and my AT&T MicroCell. I have got it to work when I tried...
  • Powercycle the iPhone.
  • Powercycle the MicroCell.
  • Reset Network Setting in iPhone.
  • Powercycle the iPhone.

Scott
 
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