Many studies are focusing on deaf children mobile learning. However, they are not concentrating on user experience (UX) testing. Current UX testing is based on existing UX evaluation models that are hard to apply due to the comprehensive measurements and lack of description on how to conduct evaluation for a more specific mobile learning process. Moreover, the existing UX evaluation models are not highlighted to be applied in testing UX for deaf children's mobile learning. Hence, this paper proposed questions for UX testing for deaf children's mobile learning to explore UX issues in offering an enjoyable learning application. Smileyometer is used to capture the data from deaf children after using a selected mobile learning application, KoTBaM and Learning Fakih. This study involves deaf children aged 7 -12 years old familiar with the mobile application. The survey is divided into two sections: i) demographic information and ii) 24 questions that the respondent must answer using a smileyometer. The survey included 38 deaf children from Malaysian Deaf School. The participating deaf children completed the questionnaires with the assistance of their teachers after using the mobile learning application in the classroom. Yet, various issues needed to be addressed in order to improve the deaf children's user experience. Special exercises should be developed for deaf children connected to their school syllabus to consolidate their knowledge and self-learn everywhere. Furthermore, games elements should be adapted so the deaf children are able to learn while playing.