M-learning implements learners’ central notion, but the current mobile tools for education are not designed for users. This may lead to the incomplete service network of M-learning. This study used the perspective of service design to offer proposals for M-learning tools. First, the iPad4’s key service gaps to Co-design concepts for users were integrated to put forward three design proposals for M-learning mobile tools. Users evaluated the design proposals by the Google Form. The results show that all the proposals achieve key service gaps’ design goals and attract users’ preference. All of them can improve users’ preference in the performance of ＂Taking Pictures Intuitively of Operability＂ and ＂Making the Best Use of Software for Interacting and checking progress＂. In general, Curved Pad’s performance is the better choice for users’ preference and design assessments. This suggests that different product demands and target groups can refer to these three proposals’ insights to promote an M-learning mobile tool to fulfill users’ requirements in the future. Therefore, the service network for M-learning can have an enhanced effect for users on the M-learning service network.