Alan Brody, a 15-year-old jazz drummer, doesn’t have the interest or time to hang out in shopping malls. So he browses the Internet on his cell phone, using a search service that has helped him find everything from Hanukkah gifts to computer software. Brody also does mobile searches for his mother, and would send her pictures of items he sees in stores, except Sandy Brody says she “wouldn’t know what to do with them.”