– Xochielt Sanchez
Answer by Robert Frost:
Unapproved electrical hardware cannot be transported on the Soyuz or used onboard ISS, so the crew do not bring their own devices.
However, there are portable electronic devices onboard the ISS. For example, there are iPod Nanos that can be used to listen to music while exercising. There are iPads that are being used as an experiment to see how they impact crew efficiency. And there are a few NanoRack payloads that utilize iPhones.