WEP Wifi Connection Problem

I am new to this forum and would really want to please help me get this problem solved. I just bought a **Sony Ericsson Xperia X10** and tried connecting it to my internet at home (**Belkin N1 router - 64-bit WEP encryption**) but it does not connect at all. It catches the internet connection and says its in very good range, I put the key but it never connects. I have tried all the different things possible via this forum, googling for answers, etc but haven't found a solution yet. **Stuff that I have tried:** 1. Tried accessing it via a static i/p technique. 2. I cannot change the WEP encryption to WPA-PSK because the internet is set up by my landlord and I am not allowed to change it. I can check the settings and it shows access to all b/g/n configurations. 3. I have another phone i.e. the new Sony Xperia S, even that is not able to connect to my wifi. 4. I am able to connect both these phones very easily to other wifi's having WPA-PSK connectivity but just not my home network. **Update:** I have been able to partially solve the problem but it is not the exact solution that I am looking for. Here's what I have tried: I have tried the WPA-PSK approach (AES encryption) and it does somehow make it work on my Xperia S (it did not connect to it instantly). Basically, there is an option of WPS (Wifi-Protection Setup) in my Xperia S which allowed me to do a Push Button Configuration (PBC) i.e. holding the router button for 3 seconds to allow my phone to access it. It assigned me an i/p address and thus made it work but spoiled it for my other housemates, so I had to get the setting back to WEP.I know it is more secure to use WPA, but I cannot change it without asking my landlord. Anyways, the point is that somehow my other phone connects to the router not instantly but via some route as given above. My question again is: Is it really not possible to connect it via WEP? Kindly help as I have been struggling a lot to find for a proper solution over the internet.