This study sought to investigate on the access and use of mobile phones for improving the coverage of agricultural extension services among farmers in the pre-harvest stages of maize value chain in Kilosa district. The study examined the use of mobile phones as a means for improving the coverage of agricultural extension services. The study adapted a cross sectional study design and a multistage sampling technique. Data were mainly collected using structured questionnaires. The results revealed that majority of respondents used mobile phones and had a positive attitude on the contribution of mobile phone in their farming business. The study results also indicated that mobile phones offered an affordable solution to farmers’ information needs and information requirements. The study concluded that the use of mobile phone to communicate agricultural information depends on information needs of farmers. The study recommended that farmers need to be encouraged and supported to access and use mobile phones in their farming business