T-Mobile's American arm has launched an investigation into how Paris Hilton's address book made its way from her Sidekick PDA/phone onto the web.
The mobile-phone firm's computer forensics team is on the case, and is considering all possibilities: "This includes the possibility that someone had access to one of Ms. Hilton's devices and/or knew her account password," the company said in a statement.
It could not provide any further details because of "the sensitivity of the situation", but advised Sidekick users to avoid simple passwords, and to change their password regularly.
Over the weekend, phone numbers and email addresses of many of Paris' celeb mates, including Christina Aguilera, Lindsay Lohan and Anna Kournikova were exposed online, along with private notes, and details of hotel and airline preferences.
In related news, UK research from mobile network services company Intervoice found that more than half of the UK's mobile phone users keep all their contact details on their phones, without maintaining a separate address book. One in three say they worry that a lost handset would mean losing touch with friends.
Something Ms. Hilton can probably relate to. ®