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Telkomsel Orbit is a product that provides an internet network that can be used anytime and anywhere, thereby attracting consumer interest. The company continues to market and develop this product so that it can continue to compete with other similar products, including by implementing several marketing methods which will be studied in this research. This study seeks to examine the impact of the independent variables, namely (X1) Personal Selling, (X2) Social Media Marketing and (X3) Sales Promotion on the dependent variable (Y1) Purchasing Decisions. This study uses quantitative data collected based on filling out questionnaires carried out by 330 respondents who are users of Telkomsel Orbit products in the Central Sumatra Region. Sampling was carried out by purposive sampling. Data analysis was conducted using Structural Equation Modeling (SEM) techniques via the SmartPLS application. Statistical results show that the independent variables, such specifically as (X1) Personal Selling, (X2) Social Media Marketing and (X3) Sales Promotion have a positive and substantial effect on the dependent variable (Y1) Purchase Decision resulting in an R-Square featuring the value of 0.267 or 26.7%. The Telkomsel Orbit marketing team is expected to continue to improve and evaluate the application of personal selling, social media marketing and sales promotions to influence consumer decisions in choosing Telkomsel Orbit products. The application of personal selling is considered the most effective in this research, so it is hoped that optimization of human resources and abilities in forming relationships with consumers will continue to be carried out. Likewise, sales promotions must be carried out more massively to be able to continue to compete with other competitors, because the best and most attractive price offers or sales promotion methods will be superior in influencing purchasing decisions. Meanwhile, social media marketing continues to be optimized, especially facing the digital world, where information is disseminated via the internet or social media, so content is needed with information content that can attract consumer interest in products.

The development of digital services cannot be separated from users' habits in using smartphones and the affordability of internet access. Smartphone users want services that can carry out various activities easily, including telecommunications. This opportunity was captured by telecommunications companies by creating provider applications for smartphones. In connection with this, PT. Telekomunikasi Indonesia Tbk (Telkomsel) launched a new provider product called by.U. The purpose of this research is to determine the factors that influence user satisfaction with the by.U application based on the End User Computing Satisfaction (EUCS) model from William J. Doll & Gholamreza Torkzadeh (1988) with six variables consisting of content, accuracy, format , ease of use, timeliness, and satisfaction. This research used simple random sampling with a total of 60 respondents who were residents of the city of Surabaya who used the by.U application. The research results show that the variables of content and timeliness have a direct effect on satisfaction. Meanwhile, the variables accuracy, format and ease of use have a positive but not significant effect on satisfaction. Timeliness is the factor that has the most influence on satisfaction seen from the results of hypothesis testing which produces the largest path coefficient value, which is 0.268.