A science paper published in MaterialsToday Chemistry reveals that cell phone signals can be used to release biological or chemical payloads from graphene oxide that’s introduced into the human body. The paper, published in September of 2022, is entitled, “Remotely controlled electro-responsive on-demand nanotherapy based on amine-modified graphene oxide for synergistic dual drug delivery.”
The study abstract reveals how a cell phone can emit signals to activate a low voltage current that interacts with Graphene Oxide (GO) molecules, causing efficient delivery of drug payloads:

This study aims to determine low-voltage-controlled dual drug (aspirin and doxorubicin) release from GO surface. Here, we have demonstrated how to control the drug release rate remotely with a handy mobile phone, with zero passive release at idle time.

Because of its extremely high surface area and complex structure composition, graphene oxide turns out to be the perfect molecule for delivery of biological or drug payloads inside the body.