Smartphones have become key enablers for users to exploit video streaming services such asrnYouTube, Hulu, Netflix. Quality of experience (QoE) represents the actual visual perception ofrnusers and it becomes a prominent concept. Considering the perception of users on the quality ofrnmobile video streaming service evaluation is an important factor to assess the actual performancernof the service that is provided to the users. So far, in Ethiopian Mobile Operator a combination ofrnobjective and subjective quality evaluation for video streaming service of mobile phone users,rnparticularly for the most widely subscribed mobile 3G network, has not been performed. rnIn this thesis work, video streaming QoE evaluation over the 3G network in case of AddisrnAbaba, for smartphone users is made using network-side data from NetProb3010 tool,rncrowdsourcing tools (YoMoApp and Speedcheck Pro) from the application side and perceptionrnof customers from the user side. rnThe application and user side measurement results were collected from a field experimentrncampaign of 35 sample users after watching 8 different sample YouTube video sessions. Inrngeneral, achieved video streaming metric results show that both subjective and objective metricsrnof QoE are not good and there is the unhappiness of smartphone customers with the currentrnvideo streaming service quality. For example, based on NetProb3010 results the average initialrndelay is 19 seconds; the average number of stalling events is 0.38 times per minute and 6.46%rnfor average stalled time rate. The application-level results show that the average initial delay,rnaverage number of stalling events, average stalled time duration and average video resolutionrnwatched results are 17.3 seconds, 0.47 times per 30 seconds, 3.79 seconds and 230P,rnrespectively. Moreover, application-level average download throughput achieved during thernexperiment period is 1.78Mbps. The above objective metric results are reflected in the subjectivernmetric (perception) result of the participants where the overall Mean Opinion Score (MOS) valuernis 2.79.