The info desk answers related to this topic can be found here:

http://wikimania2011.wikimedia.org/wiki/Wikimania:Information_Desk#mobile_internet

http://wikimania2011.wikimedia.org/wiki/Wikimania:Information_Desk#Able_to_buy_prepaid_.28micro-.29SIM_cards_in_Israel.3F

Cheers,

Jutta von Dincklage

>As a quick reply for now, please look at my previous answers to similar
>questions on the Information Desk on the wiki.
>We'll try to provide more information than is available there.
> 
>Harel Cain
> 
>Wikimania 2011 local team