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Any good book or course on how smartphones work at technician level?

I'm an Apple technician and miss having a bit more knowledge on smartphone technology at technician level, such as what bands are used by a carrier in any country and what smarphones/iphones can provide better service for those carriers.

I'm now googling for most of this stuff, but I'd like to know if there's any book, online course (free or paid) to get this information at technician level (most books I found in amazon are too advanced for a technician).

Please guys, read my question carefully before giving an answer, I just need advice on a book or course, don't give me explanations or cellular technology. I know you'd do it with the best purpose, but I don't like reading answers that waste my time.
 

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