Step 1: Retrieve the Phone Number from a Device

<rci_request version="1.1">
    <query_state>
       <mobile_stats />
    </query_state>
</rci_request>
<rci_reply version="1.1">
    <query_state>
       <mobile_stats>
          <mobile_version>1.1</mobile_version>
          <modemtype>GSM</modemtype>
          <rssi>-42</rssi>
          <quality max="5">5</quality>
          <g3rssi>0</g3rssi>
          <g3quality max="5">0</g3quality>
          <rstat code="1">Registered (Home Network)</rstat>
          <cid>34016</cid>
          <lac>32004</lac>
          <imsi>310410316937398</imsi>
          <iccid>89014104243169373988</iccid>
          <phnum>19522213895</phnum>    <!-- phone number of the device -->
          <manuf>SIEMENS</manuf>
          <model>TC63</model>
          <sn>355633002498656</sn>
          <rev>REVISION 02.000</rev>
          <varinfo index="1">
             <desc>Network Name</desc>
             <data>N/A</data>
          </varinfo>
          <varinfo index="2">
             <desc>(E)GPRS Status</desc>
             <data>GPRS Attached</data>
          </varinfo>
          <varinfo index="3">
             <desc>Current Band</desc>
             <data>850 MHz, 1900 MHz</data>
          </varinfo>
          <varinfo index="4">
             <desc>User Band Selection</desc>
             <data>Automatic</data>
          </varinfo>
          <varinfo index="5">
             <desc>Mobile Channel</desc>
             <data>235</data>
          </varinfo>
          <varinfo index="6">
             <desc>Mobile Country Code</desc>
             <data>310</data>
          </varinfo>
          <varinfo index="7">
             <desc>Mobile Network Code</desc>
             <data>410</data>
          </varinfo>
          <varinfo index="8">
             <desc>User Carrier Selection</desc>
             <data>Automatic</data>
          </varinfo>
          <varinfo index="9">
             <desc>PLMN Color</desc>
             <data>3</data>
          </varinfo>
          <varinfo index="10">
             <desc>Base Station Color</desc>
             96
             <data>5</data>
          </varinfo>
          <varinfo index="11">
             <desc>Max Power RACH</desc>
             <data>0</data>
          </varinfo>
          <varinfo index="12">
             <desc>Min Rx Level</desc>
             <data>-111</data>
          </varinfo>
          <varinfo index="13">
             <desc>Base Coefficient</desc>
             <data>68</data>
          </varinfo>
          <varinfo index="14">
             <desc>SIM Status</desc>
             <data>5: SIM Initialization Complete</data>
          </varinfo>
          <varinfo index="15">
             <desc>SIM PIN Status</desc>
             <data>Ready</data>
          </varinfo>
          <stats_index>5</stats_index>
          <multi_sim_enabled>no</multi_sim_enabled>
       </mobile_stats>
    </query_state>
</rci_reply>