Echoing the others, the short answer is 'No.'
The long answer, aside from unique, very expensive, foci that take several runs worth of materials and time (in addition to the cost) and would likely require a human sacrifice and a focus addiction, as the example Reaver mentioned did, there are only a few ways for a 'mundane' to use/access magic, ranging from 'potentially dangerous' to 'you done f*cked up'.
Quickened/Anchored spells are the go to for mundanes needing some kind of magic put on them, without having a mage doing the casting in the moment. There's lots of good things to be said about a Quickened Increase Willpower, for instance, or an Anchored Mana Static spell set to activate when an incoming spell is detected. However, those spells will light you up on the Astral, since you won't have any masking, and you won't be able to walk through wards without either stripping your defenses or setting off every alarm in the place. Also, you have to have a mage willing to cast the spell in the first place. So we'll call this one 'potentially dangerous'
Then you have BADs. Several Bio-Awakened Drugs and Magical Compounds have potential to give you certain magical abilities during their duration. They're expensive, don't last too long, and come with some drawbacks that can be pretty crippling, depending on the drug. Oh, and let's not forget the whole addiction thing, because BADs have that name for a reason. Trying to keep up a constant defense in this way is stupid, at best.
Continuing on our tour of horribly bad ideas, we come to spirit pacts. Spirits (ESPECIALLY free spirits!) may occupy the whole spectrum from good to evil, but their thought processes can only charitably be called 'humanish'. They are creatures alien to our world. Sure, they might not all be chasing Sigourney Weaver, but even the Roswell Greys can't be counted on to act in a way a metahuman can always (or usually) predict. A spirit pact offers potential power, but at a nasty potential cost.
And then the final stop on our tour is, of course, spirit possession/inhabitation. If you're very lucky, it is possession, and you merely get shunted to the side for a bit, trapped in your own head and forced to watch as something else controls your body, speaks with your voice, and generally acts without your advice or consent. If you're not lucky, it is inhabitation, and you're a brand new insect spirit! Well, not you. Your soul's been eaten and an inhuman creature is wearing you like a cheap suit. Like in the first Men in Black movie, except not nearly as pretty. So by this point, you've done f*cked up.
Long story short? Pray that anyone promising actual magic to a mundane (other than quickened/anchored spells) is LYING to you. If they aren't, then you're in deep, deep drek.
