Note: This tip won't work for all research environments. In some labs, there is no-phone policy. Usually, it's because the work being done is easily compromised by having a phone around (because the phone cannot be sterilized) or because having a phone distracts the researcher in a way that is a safety hazard. So, this tip only applies to students who have discussed the lab's cell phone policy with their in-lab mentor or PI, and are allowed to use the phone.
When you're conducting an experiment or doing a technique, take photos of anything that looks “odd” if your research mentor isn't around to help.
Sometimes, it's easier to describe and troubleshoot a problem if you have a photo to go along with a statement such as: “I don’t think my culture lysed correctly," or "When I filtered the solution, it looked chunky," or "The tissue kept tearing on the microtome."
Obviously, this won't work for all kinds of wet benchwork (such as enzymatic reactions), but when a photo could be helpful it's a great resource to have.