Merge "Update for IP call prefix"

import android.os.SystemProperties;

import android.provider.Contacts;

import android.provider.ContactsContract;

import android.provider.Settings;

import android.text.Editable;

import android.text.SpannableStringBuilder;

import android.text.TextUtils;

        boolean isIPPrefix = intent.getBooleanExtra(IP_CALL, false);

        if (isIPPrefix && number != null

                && subscription < MSimTelephonyManager.getDefault().getPhoneCount()) {

            return IP_CALL_PREFIX + subscription + number;

            String IPPrefix = Settings.System.getString(context.getContentResolver(),

                    IP_CALL_PREFIX + (subscription + 1));

            if (!TextUtils.isEmpty(IPPrefix)) {

                return IPPrefix + number;

            }

        }

        return number;

    }