The Finnish brand was founded by former Nokia executives. It provides security technology to allow people to access financial services, such as online banking, on their mobile phones.
The technology is compatible with all GSM mobile phones and has been used by banks, governments, and corporations across Europe.
Charlotte West, director at Harvard PR will lead the retained account.
The media and analyst relations campaign will aim to increase brand awareness among mobile operators and financial organisations in the UK.
Harvard will also work to raise Valimo's profile in the run-up to the 2009 Mobile World conference.