This happens to me as well (Nexus4, dual boot from dev channel).

To work around this, I have to execute the following commands:

/usr/share/urfkill/scripts/flight-mode 1      # turn on flight mode
/usr/share/urfkill/scripts/flight-mode 0      # turn off flight mode

After this, the phone may no longer say "No SIM detected", but the
mobile carrier may be still listed as "Unknown". To fix this, I further
exec the next command:

/usr/share/ofono/scripts/enter-pin pin xxxx

Where xxxx is my SIM's pin and now I can connect to my carrier.

Maybe related to this: 
* 
http://forum.xda-developers.com/ubuntu-touch/help/sim-detected-nexus-5-t2858419
* https://bugs.launchpad.net/ubuntu/+source/urfkill/+bug/1321627

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https://bugs.launchpad.net/bugs/1371332

Title:
  No SIM card deteced for UBuntu Touch when dual booting with Android on
  Nexus 5

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