The dramatic growth in the use of mobile devices across different environments and fields has contributed significantly to mobile learning (mLearning). Students have benefitted through the multimedia features of mobiles and can utilize emerging technologies with their mobile devices for learning purposes. Despite the relevance of mobile learning in formal and informal learning environments, it seems to be less explored in Nigeria. Research has shown that teachers play a significant role in adopting any technology in the classroom, so it is essential to probe into preparedness related to the adoption in the classroom. The paper examines the preparedness of preservice and in-service teachers to use mobile devices in their classrooms using an online survey on mobile learning readiness and technology adoption stages. Quantitative data revealed that teachers are willing to adopt mLearning, and rate themselves above average on the technology adoption stage; however, a few factors like an unsupportive curriculum and lack of infrastructure are causing its setback. The research recommends that more awareness be raised to promote its adoption, create a supportive curriculum and provide the needed infrastructure in the classroom to support its use.