The Labour MP Siobhain McDonagh has taken legal action against News International and The Sun aiming to prevent the newspaper publishing any confidential information which she claims could have been taken from her stolen mobile phone.
In a claim lodged at the High Court, the Mitcham and Morden MP is also seeking damages in relation to breach of privacy and breach of confidence linked to the theft of her phone.
The MP's solicitor, Mark Thompson, confirmed that proceedings were issued against News International a week ago and related to a stolen handset.
Two months ago a 35-year-old Sun journalist was arrested and bailed by officers from the Metropolitan Police working on Operation Tuleta, the force's specialist investigation into computer hacking and invasion of privacy.
The arrest was confirmed at the time as being linked to suspicion of "handling stolen goods".
News International last night declined to comment on the legal action.