I got the answer from the raspberry pi official forum. Thanks to MrEngman
There are two versions of this wifi adaptor. V1 has the driver included in most images, V2 requires you to download and install a driver as it is not included in the Linux images.
It appears you probably have V2 and need to download and install the driver. You can determine the wifi version you have if you use command lsusb. This will list the WN725N V2 as
Bus 001 Device 004: ID 0bda:8179 Realtek Semiconductor Corp.
The important info is the ID 0bda:8179.
If it shows this you need to download the driver. If you use a recent version of Raspbian there are precompiled versions available.
Precompiled versions of the driver are available for Raspbian as follows
for 3.6.11+ #538, #541, #545, #551 and #557 use 8188eu-20130830.tar.gz
for 3.6.11+ #524, #528 or #532 use 8188eu-20130815.tar.gz
for 3.6.11+ #371 up to #520 use 8188eu-20130209.tar.gz
Use command uname -a to determine the version you have e.g.
pi@raspberrypi ~ $ uname -a
Linux raspberrypi 3.6.11+ #551 PREEMPT Mon Sep 30 14:42:10 BST 2013 armv6l GNU/Linux
pi@raspberrypi ~ $
Download and install the driver using the commands
wget https://dl.dropboxusercontent.com/u/80256631/8188eu-2013xxyy.tar.gz <--set data code for driver version above
tar -zxvf 8188eu-2013xxyy.tar.gz <--set data code for driver version above
sudo install -p -m 644 8188eu.ko /lib/modules/3.6.11+/kernel/drivers/net/wireless
sudo insmod /lib/modules/3.6.11+/kernel/drivers/net/wireless/8188eu.ko
sudo depmod -a
You can check if the driver is loaded OK with command ifconfig It should show wlan0 something like
wlan0 Link encap:Ethernet HWaddr a0:f3:c1:25:7d:28
inet addr:192.168.16.15 Bcast:192.168.16.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:125431 errors:0 dropped:305 overruns:0 frame:0
TX packets:5821 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:21001551 (20.0 MiB) TX bytes:762826 (744.9 KiB)
Again Thanks to: MrEngman on the raspberry pi original forum
Also I had the #474 which needs: 8188eu-20130209.tar.gz