Cheating during a test I took a test today morning and I saw that the person sitting next to me used her phone repeatedly, I believe it was to check the power point slides for answers. The fact that this student also asked me for the answer to a question before I left also raises my suspicious slightly.

I don't know this person. I decided not to report it this morning because I don't feel quite alright accusing anyone, at least not in person. I am tempted to send an anonymous email and explain what happened, although I don't think it will make any difference. I'm not happy at all with the incident, because the test wasn't exactly trivial and some of us might fail, while other people could pass simply copying the answers from their phone.

What should I do?
A good question!

There is not much you can do now. You cannot prove anything and can not even name the cheating person. If you think that explaining the situation can help the invilgator to make cheating less likely the next time, you should write them an anonymous email.

I've heard that there are some universities with so-called "honor codes" that tell you to report this - if this is the case for you, do absolutely report it (anonymously).