IPhone 3Gs acquiing unfamiliar IP address

Question

Guys i am helpless, I bought ths iphone 3gs from italy while i was on a visit, I tried wi-fi there and it worked just fine the easy way, now i am back in Jordan and trying to conncect to my home wireless router which employes Dynamic IP address starting 192.168.15.~, the network works just fine on all other computers distributing IP addresses in range, however when i tired connceting my 3gs there is no internet access (unlike my previous iPhone 3G which is still working just fine with the right IP address), after trying everything i found out that my 3gs is acquiring a strange IP which is 169.254.160.238 which is far strange from my router's range.
I tried 'forget this network' and I tried giving the iphone a static IP just to realize whtat is the issue but no success, I am really helpless i don't know what is the problem and, presumably it has nothin to do with my carrier as I am trying wi-fi which is supposedly a closed netwrork managed by the router.
any help would be really appreciated
I forgot to mention that in the modem's/router's web based utility the 3Gs MAC address is assigned a right IP address (192.168.15.21) unlike what appears on my 3Gs's wi-fi settings.
Message was edited by: HaddadM

Answer 1

Thnx William but that is not the case coz all other devices(laptops, desktops, PS3...etc) r working just fine.
after alot of time trying to figure out what the problem is I figured out the problem but cant seem to sove it:
I have three router in my network one acts as a DHCP server (router 1) and the others act as AP, they all brodcast wirless (SSID) based on the internet connection coming from router 1, all devices including my old iphone 3g connect on all three router no problem and get assigned an ip address within range 192.168.1.~, however when i connect my 3gs to router 1 (DHCP) it works perfectly and connects to the internet but when I connect to any of the other routers I cannot have internet access and it takes a long time to show the wi-fi symbol (3 bars), I managed to overcome this by giving my second router another network IP i.e 192.168.2.~ and made it aother DHCP server (but another network) that way my 3gs connected just fine like the 1st router, the problem with this solution is that I am on two seperate networks but same internet feed so I cannot communicate between lapto, desktop, PS3...etc
I guess I have two options:
1- wait for an update for 3gs hoping this could be solved and keep my network as is.
2- assign three different networks just for 3gs to work and sacrifice my whole home sharing.
SOOOO Pleaseeeeee if anything know anything or could help me in anyway please and post, is it just me or have i heared alot of Wi-Fi problems with 3gs!!!