Smurfette's magic compact is a device that Smurfette used while she was an un-Smurf in the cartoon show version of "The Smurfette" and the Season 7 episode "Smurfette Unmade". It had a magic mirror that allowed her to contact her master Gargamel whenever she needed to communicate with him. Visually it resembles a flip-top cell phone.
LD Stories/Expanded AU
Within The Light and Dark Series, which crosses over with the Expanded Animated Universe, Smurfette still owns this compact mirror, which now serves as a reminder of her own perseverence against the root of her creation. When she is feeling low, she may examine it and reflect on the past until it cheers her up again. She has also considered several times whether or not she should have Papa Smurf dissenchant it, but so far has not made the final call.
Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, Smurfette eventually gave up the compact when Empath found it among her hidden things and Smurfette suspected that Gargamel might use it for his own evil purposes. Handy took the compact and reverse-engineered it so that he could make similar devices for his fellow Smurfs to allow two-way communication with each other across long distances, much like a modern-day cell phone, calling these devices the portable telesmurf. However, Gargamel used that and the magic compact to control the Smurfs into creating a teleportation spell that would transport him to the Smurf Village. After Papa Smurf misdirected Gargamel so that he would appear in a cave full of dragons instead, he destroyed the magic compact so that it would never be used again.
Smurfs: The Magical Blue Stories
In the Smurfs:The Magical Blue series, Smurfette still had the compact in possession, even when she was still a real Smurf, she still kept. She now fears that something horrible may happen and thus gave it away to the hands of Papa Smurf along with his female counterpart Mama Smurfette and soon-to-be-leaders of Smurf Village, Father Smurf and Mother Smurfette. Unfortunately, her fears eventually came to fruition when Builder and Gearbox "borrowed" it to make it into the second telesmurf. However this was seen by Gargamel and Cerahine and thus used this to their advantage to teleport themselves into the village. After being tricked by Smurfette, Sonio and Sonia, the compact was later destroyed thus never reappearing again.