A note that says “done” leaves the next person with a question: what was done?
Give your field crew a clear way to record the work while the details are in front of them. TankSpotter supports field forms, photos and location records. It also works without a cell signal.
Ask your service manager to review one recent job with the tech who did it. Can the office tell which site it was, what work took place and what still needs attention? If someone has to guess, find the missing detail and fix the form or the handoff.
Then check how records reach the office after a stop with no signal. The crew should know how to confirm the record arrived.
A phone can hold a lot of forms. The useful record is the one your next person can read and act on.