First off, you should tell them not to use WEP, it's inherently flawed in its security design, easy to steal the key in a few minutes... back to your question, are you actually getting some internet and then it cuts out? Typically from a security standpoint unless they are bandwidth monitoring it shouldn't work and then not work. Your cell shouldn't be creating enough bandwidth to get flagged, and doubtful they have a setting like that enabled if they are using wep. Original point being, it should be all or nothing, if you don't get internet its probably because they have it locked down with a rule like mac filters.