How to steal ANY Wi-Fi network via iphone?

I have iphone 4 on ios 6.1.3 not jailbroken 32GB i used to have wifispots to get thomson password but i wanna know hot to get any Wi-Fi pass

There's NO way to steal any Wi-Fi network, unless you're an excellent hacker.

NO WAY! { DROP THE IDEA } !

Getting Wi-Fi password is not a easy job to do. However, if the security type is wep then it can be hacked so easily withing 10 minutes using an OS backtrack belonging to Linux. Search in web about Wi-Fi hacking via backtrack.

You would need a laptop with a proper wireless network card. You would have to place it within range of the wireless network of your choice. Make sure that it will not get stolen when you leave it there day and night. It would require you to monitor all network packets of a wireless network for perhaps days before you have captured enough packets to be able to crack the keyphrase, which may then take days as well. If the wireless network is not used a lot, it may take months even and there's no guarantee that you will then even be able to crack the keyphrase. It used to be easier back in the day, but wireless encryption has improved a lot, making it more time consuming. Companies who use their wireless network a lot are your best bet, as you would have a sufficient amount of packets in the shortest time, but chances are big that they use RADIUS for example, still blocking your access once you have cracked the keyphrase. To be able to do all this properly, you would have to know your stuff. If you do not even know now what the OSI model is for example, then forget about it.