The two have joined forces with the launch of www.recycle.lastminute.com which went live on April 2 and will promote the recycling of mobile phones as well as carbon management.
Envirofone.com is operated by Eazyfone Group, whose chief executive Pete Petrondas said: Hundreds of thousands of people use lastminute.com every day in the UK alone.
Even if 5% of them are encouraged to trade in their phones, this would already represent a large number of mobiles being re-used and diverted from landfill sites.
On the lastminute.com website, consumers can now choose to trade in their unwanted mobiles for cash or donate them to Climate Care, the organisation which sells carbon offsets.
Its work involves tackling climate change on behalf of individuals or businesses by funding projects that avoid, reduce or absorb greenhouse gasses such as carbon dioxide.
Lastminute.com commercial managing director Frazer Robinson said: Like our customers, we are aware of how travel impacts the environment. Lastminute.com is committed to carbon neutrality, and as an online trader our carbon footprint is inherently low when compared to some parts of the travel industry.
Offering our customers the ability to trade in their old mobile phones to fund carbon offsetting projects is one way of doing more for our environment.