For observations of small stuff, it depends how much weight you want to carry around and whether you want to document or get artistic shots. I have moved from reflex (Nikon D90) to phones, I was pondering to buy some good macro lens but since I have seen that phones with 108Mp cameras are already out, considering how handy is the small size, ability to browse the internet and having integrated GPS I’ll try to have the price tag drop a little bit and have my current mobile wear out and then I’ll give it a try. The thing I am not using my current phone for are calls 
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Moreover, with a cheap clip on lens and lots of patience you can get further. See my examples here
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