This is my current favourite, the Miss Dior Cherie phone charm from a haul [or damage] made last Friday at Isetan KLCC. They also have a huge promotion at KLCC's concourse area, if you'd like to check it out.
I think the charm is such an excellent idea. I mean, I carry my phone everywhere I go but I do not have a bottle of fragrance everywhere I go. And being a busy WAHM, juggling work and chores while having to lug a toddler in and out sending my eldest to school (and picking him up from school), I do think that spritzing on perfume is not a big priority in my life. So, with this charm, I can always do a last minute spritz whenever the need arise.
Heck, I even remember one instance in a cinema when this disgusting man actually took out his shoes and his socks reek a nauseating stench. At that time, I had a vial with me and I actually sprayed the perfume in his direction ;P
I'm not sure how much you need to spend to get this phone charm from Dior but I do believe it entails some purchase of Miss Dior Cherie. As for me, I bought some other stuff and I asked the SA if they have some other stuff to give out since I didn't have time for their free makeover and photography session.