This article presents a qualitative study focusing school science in two vocational classes, upper secondary school, Norway. The fact that many vocational students find little meaning in school science forms the backdrop. The students were introduced to teaching combining an excursion to a district heating plant and classroom lessons, with the use of mobile phones for documentation. Thematic analysis is used to explore the students’ experiences by analysing their behaviour and utterances. A multimodal semiotic analysis is used to examine the students' digital stories. By offering the students teaching in a real life vocational facility, we found that the students engaged in the related school science subject matter. They do perceive the use of phones for documentation as personal authentic and relevant working method. The learning potential arising when the mobile learning bridged the two learning venues overshadowed the possible pitfalls of using smartphones.