How to install unsigned.apk on a mobile phone

I made the application in eclipse and android sdk and made .apk (go to the "android tool" and export the "unsigned apk"), so I had the .apk file and then I sent it to the mobile SD card and tap the .apk file to install it on a mobile phone, but there was one error message "the application cannot be installed", so now, how to install it on my device, my development version is 2.2, and I am making the application using the target "target = Google Inc. ": Google API: 7" now how to install it. I also allow mobile devices to install a third-party application. My manifest file is below ... thanks for the help in adv.

  <?xml version="1.0" encoding="utf-8"?>
  <manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.androidpeople.tab"
  android:versionCode="1"
  android:versionName="1.0">
   <uses-permission android:name="android.permission.INTERNET" />
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
 <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
 <uses-permission android:name="android.permission.CALL_PHONE"/>
 <application android:icon="@drawable/icon" android:label="@string/app_name"

  <uses-library android:name="com.google.android.maps" />
    <activity android:name=".SplashScreen"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
       </activity>

             <activity android:name="currentlocmap" />
             <activity android:name="filter" />
             <activity android:name="keywordsearch" />
                     <activity android:name="Artistspacedetailview" />
                         <activity android:name="loadingimage" />
                         <activity android:name="keywordpagetabs" />
                         <activity android:name="filterpagetabs" />
                          <activity android:name="artistspacedetailviewTab" />
             <activity android:name="filtersearchresultparsing" />
             <activity android:name="keywordresulttab" />
             <activity android:name="filterpageresulttab" />
              <activity android:name="artspacedetailShowingNow" />
              <activity android:name="detailviewshowingnowTab" />



               </application>
                  <supports-screens android:anyDensity="true"
                android:largeScreens="true"
                android:normalScreens="true"
                android:smallScreens="true" />
                   </manifest> 


    default.properties

     **target=Google Inc.:Google APIs:7**