title: Identify if an Android tablet has a sim card slot
body: <p>Is there a way to check, from within my application, if a tablet has a sim card slot? </p>
  
  <p>My requirement is to find out if a tablet is a Wifi only or a Wifi + Cellular unit. 
  I checked the earlier links provided on Stack Overflow for this, and none of them seem to be working for my device. The Wifi only unit returns a <code>TYPE_MOBILE</code> under the network info. Both the Wifi and Cellular units return a <code>PHONE_TYPE_NONE</code> and <code>SIM_STATE_UNKNOWN</code> hence even those checks are not applicable. </p>
  
  <p>The IMEI returned is also null in both the cases. If there is a valid sim card inserted inside the sim card slot then I can validate if the unit is a cellular unit, but if the cellular unit has no sim card inserted, or if the sim card slot is bad, then I am unable to distinguish between a cellular and a wifi + cellular unit </p>