How can Wirefly.com not charge CA phone sales tax and get away with it ?

I have a cellphone store and i always have to charge sales tax on the full price of the phone to our customers, however i want to know how Wirefly can get away with NOT charging sales tax in CA? wouldnt they get audited and get in deep trouble or do they have some kind of loophole im curious about.
above all assuming bundled transaction (with 2 yr service contract)
 
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