Thank you Beth and Sara. We are currently using older code to simply wake up the Mayfly, take data, and write to an SD card. This has been deployed outdoors and works. I see the best way to implement the cell phone telemetry is to use code based on “logging_to_EnviroDIY” and the associated libraries. I have only had a chance to download this code a few days ago. I am not that familiar with Object Oriented Programming, but I think I can see what is going on. I will test it in the next day or two.