How to specify hardware requirement through code?

I have an android application which has a provision to controls calls ie, allow or block specific incoming & outgoing phone calls.Here is part of manifest file.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="xxxx.xxxxxx.xxxxxxx"
    android:installLocation="internalOnly"
    android:versionCode="1"
    android:versionName="1.0" >
     <uses-feature
        android:name="android.hardware.telephony"
        android:required="false" />
    <uses-feature
        android:name="android.hardware.location"
        android:required="false" />
    <supports-screens
        android:anyDensity="true"
        android:largeScreens="true"
        android:normalScreens="true"
        android:smallScreens="true"
        android:xlargeScreens="true" />
    <uses-permission android:name="android.permission.CALL_PHONE" />
    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
    <uses-permission android:name="android.permission.MODIFY_PHONE_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
     <application>
        </activities>
        </services>
        <receiver android:name="xxxx.xxxx.ReceiverOutGoingCall" >
            <intent-filter>
                <action android:name="android.intent.action.NEW_OUTGOING_CALL" />
            </intent-filter>
        </receiver>
        <receiver android:name="xxxx.xxxx.ReceiverIncomingCall" >
            <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE" />
            </intent-filter>
        </receiver>
    </application>
</manifest>

This application does not show for some devices in Google play.After a long time search I understood that it is due to <uses-feature> hardware requirements. No i want to remove the required hardware features for phone calls from manifest and check them from code.

Some tablets which does not have a Phone Call functionality does not show my application.So i want to make my application available to these tablets which lacks the required hardware.How can i achieve this?

Thanks in Advance

Some permissions automatically impy feature requirements.

This is what the API Guides says: "For any of the permissions below, you can disable filtering based on the implied feature by explicitly declaring the implied feature explicitly, in a element, with an android:required="false" attribute."

Your permissions impliy the features android.hardware.wifi, android.hardware.location.network, android.hardware.location.gps, android.hardware.location and android.hardware.telephony.

You set only two of them to android:required="false". So you might try to set the other permissions to not required, too.