The study was conducted to identify the job satisfaction factors and measure the level of job satisfaction of mobile telecom sector employees in Bangladesh. For this purpose 220 data were collected from six largest mobile companies. Job satisfaction survey (JSS) questionnaire contain three (pay/benefits, organizational factors and managerial factors) main factors and within three factors sixteen sub factors were used to collect respondents opinion regarding to the job satisfaction. Pearson chi-square and correlation were used to test the hypothesis. The result shows employees are moderately satisfied with pay/compensation, fringe benefits, workplace, organizational reputation, supportive management. Employees are slightly satisfied contingent rewards, recognition, co-workers behavior, logistics support, relationship with supervisor, proper communication. On the other hand employees are dissatisfied on promotion, job security, work-load, organization rules and regulation, sense of achievement. The result also shows demographic variables (age, sex educational level) are negatively related with overall job satisfaction of the employee. Finally this is found 34.1% employees are satisfied and 13.2% employees are dissatisfied towards the overall job satisfaction factors.