Android Device phone call ability

if (((TelephonyManager)getContext().getSystemService(Context.TELEPHONY_SERVICE)).getPhoneType()
    == TelephonyManager.PHONE_TYPE_NONE)
{
    // no phone
}

EDIT I’m surprised it comes back PHONE_TYPE_CDMA. Here’s another possibility:

if (((TelephonyManager)getContext().getSystemService(Context.TELEPHONY_SERVICE)).getLine1Number()
    == null)
{
    // no phone
}

This will require the READ_PHONE_STATE permission.