Vodafone Turkey completely renewed its infrastructure in the past year in Samsun and Sakarya and increased its 4.5G coverage in Samsun to 80 percent and doubled coverage in Sakarya. As part of a promotional campaign, subscribers from the two cities who have not used 4.5G in the last month can get a 4 GB internet package at no cost between 6 July and 6 August by sending the text '4bucakG' to 4545. The operator said it's deploying its 4.5G infrastructure in 81 provinces.
Source: https://www.telecompaper.com/news/vodafone-turkey-increases-45g-coverage-in-samsun-sakarya--1204617