Who manufactures the chips for Android[-based] phones?
It varies by actual manufacturer (Samsung, Sony, HTC, LG, etc.)… but you can bet that SWKS chipsets are in the vast majority of the higher-end and flagship models, and are embedded in nearly -all- of the models being advertised by the major carriers. And I’m pretty sure that SWKS chips are also in the Nexus devices from Google, but manufactured by third parties (HTC, Huawei, Motorola, and others).
The Nexus 6p is the the top of the line, and here’s a teardown showing that there is Skyworks 77814-11 power amplifier module for LTE in there (along with other stuff from Broadcomm, Qualcomm, etc.):
https://www.ifixit.com/Teardown/Nexus+6P+Teardown/51660
And here’s one for the Nexus 5x:
https://www.ifixit.com/Teardown/Nexus+5X+Teardown/51318
The Samsung Galaxy S6 has multiple SWKS parts:
http://www.ibtimes.co.uk/samsung-galaxy-s6-components-reveal…
The Apple Watch… SWKS Wi-Fi and power amp parts
iPhone 6s… SWKS Low-Band LTE and mid-band PADs
Someone else can dig up and prove/disprove other models at their whim, but that’s enough to know what’s being sold and where it’s landing.