In this book, Dev is always on his phone. Until one day, it disappears! Can Dev solve the puzzle of where his phone's gone? This title is for readers aged 7 to 11 years old. The Phone Puzzle is at Oxford Reading Level 7. It is a fully decodable book for pupils who are working below expected standard in their reading. The Rise series ensures that older struggling readers have books with age-appropriate content and topics, that look like the books their peers are enjoying, but are written at a level they can read successfully.