Sounds to me like his settings need to be changed. If you set your cell phone to "check in" (location services), you're giving those locations permission to a) know that you're there and b) remind you to come back. If you don't want that to happen, you have to set your privacy settings to prevent it. I have -never- had an advertisement targeted for me from local businesses that I didn't intentionally sign up to receive.
I do get random spam from strangers, but that's because the person who had this phone number before I signed up for the cellular service was of dubious moral fiber (opportunities to "date" strangers, offers for loans, collection notices, etc etc). But they're all looking for Simone, and I'm not Simone. She's the one who had the phone number before it was assigned to me (yes, phone numbers get recycled).
In any case, it's nothing the stores and businesses are "doing" actively. They have their ads out and available, and those ads will automatically tag you if you've set your cell phone up to receive them. Turn off that feature, and you won't get the ads anymore.
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