Hi Lois, those are two great questions. Let me answer the 2nd one first. I make sure the students and parents know that a cell phone is not required for class, it is only an enhancement to instruction, but be that as it may I try to put a device in every students hand. At the beginning of the year I ask parents if they would be willing to donate any of their old cellphones that they may have lying around their house. From that request I usually receive 5-10 devices I can factory reset to be used with school wi-fi to tweet and take pictures. This usually allows me to put a device in each students hand or at least allow them to trade off from lab to lab. As for the first question I have students take pictures to document the lab as the experiment is taking place allowing them to digitally record their procedures. When it comes time for them to analyze their information for their conclusions the pictures allow them to go back and answer their questions more thoroughly by working off more than just their memory and collected data. I have the student refer back to their pictures and include them in the formal lab write up they complete using a shared Google document. I have found that the pictures have allowed my students to think more deeply and create more complete lab write ups than ever before.