The company’s branding was evident throughout the festival, including four stands that offered SIM cards and free Lebara paraphernalia.
Lebara ran competitions throughout the day, where attendees could win prizes including an iPad Air.
The brand said its sponsorship of the festival is a reflection of its ethos, striving to offer accessible products to migrant communities throughout the world to make their lives easier.
Now in its second year, the festival, which was held at Potters Fields Park on South Bank, is a celebration of Polish culture in the UK. It included traditional and contemporary Polish music from three of the best Polish folk groups in London, as well as Polish national dancers, cuisine and art.
Ewelina Krzysztofik, managing director at event organiser 2Sisters PR, told Event: "The second edition of Days of Poland Festival turned out to be a huge success.
"The event wouldn't be possible without the help of our sponsors and clients. We are looking forward to the next year."