Did she really invent cellular technology?

No, it's complete bullshit. What really happened is that Lamarr and a guy named George Antheil filed a patent for a radio communication device for torpedoes. In this patent, they supposedly invented the concept of "frequency hopping" technology. There's just one problem with this claim: Frequency hopping was first described by Nikola Tesla way back in 1903. Both the German and US militaries used the technology before Lamarr and Antheil filed their patent.

There is also the inconvenient fact that radio signals can't travel through water, which means their invention would've never worked. Torpedoes are in fact controlled with thin cables attached to the launch vehicle (usually a submarine). Lamarr and Antheil's "patent" was just an incompetent application of an idea first developed by others.

If this woman came back from the dead looking like her prime photos and knocked on my door, I would not only believe her claims about inventing cellular technology, but I would also want to take a bath with her.

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There were multiple inventors of Frequency-hopping spread spectrum, but not implemented until the 1960s. It is easy to learn electronics if you are good at math.

Ignore the troll who claims torpedoes did not have radio control! (Wikipedia)

Well, I saw a film about Hedy at the local Jewish Film Festival, and yes - apparently she DID come home from the movie studio and invent stuff in the basement! Mostly small things, but she and a friend did actually invent the torpedo-targeting device in question, because she wanted to do something about all the U-Boats that were taking out allied shipping.

She had no background in engineering, in fact she left school at 16, but she was a bright and creative person and she was wasting her time as an actress. It really is a shame that she didn't go to college and really develop her mind, because it's not like she was a good actress!

She didn't invent frequency hopping. Germans were doing that in WW I.

She invented a method for frequency hopping that was pretty clever, automating it with a player piano like device. It was originally to be used with toroedoes, to keep the signals that controlled them from getting jammed.

It made use of some principles that are still used in cellular technology today, but she didn't invent that either.

The media like to simplify and exaggerate so all kinds of things have been written about her.

I'm sure she was very intelligent, but like I already said, she did not invent cell phones or wifi or anything that advanced.

Electrical engineering is a broad field and isn’t limited to circuit design or even just electromagnetics in general. It overlaps with several other fields including applied mathematics. One of the core subject areas an electrical engineer (not to mention other engineering areas such as mechanical) studies is “signal and systems” and “control theory” which are applied mathematics and apply to not only engineering and physics but to economic systems as well.