LinearLayout on android

I was trying to create a sign up form for my Android application

This is my XML code

 <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/mynumber"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Number +961"
        android:textSize="20sp"
        android:color="@android:color/white" />

    <EditText
        android:id="@+id/editTextNumber"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="Number"
        android:textColor="#FFFFFF" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="vertical" >

        <Button
            android:id="@+id/buttonCreateAccount"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_marginBottom="60dp"
            android:background="@drawable/ic_create" />
    </LinearLayout>
</LinearLayout>

If you notice the first LinearLayout has a horizontal orientation and gravity (I want both the textview and edit text to be next to each others)

After the first linear layout i want the create account button to come out

However it is showing up on the same line with the previous edit text and text view

Any idea if i should change in the settings of the second linear layout