For this project you will need
cell phone charm lariat findings, you can get them from Rings & Things in quantity, or I've found smaller packages at local craft stores, and I can buy them one at a time from my local beadstores.
Sterling headpins, I used sterling because for me, they've always bent and coiled better then the plated kind, I've had problems with sometimes snapping the plated ones.
Some beads, I used faceted glass and little silver daisy spacers
a pair of needle nose pliers
a pair of small round nose pliers
wire cutters

This is the style cell phone lariat finding I used.

String your beads on the headpin

Then hold the headpin just over the beads with the tips of your needle nose pliers, bend at a 90 degree angle.

The extra space above the beads is the wire you will wrap around to finish the headpin securely.

Wrap the end of the headpin over the bend into a loop over the tips of the round nose pliers. Slip that loop over the split ring on the lariat. I didn't do that with this one because I'm going to use it for an earring instead.

Wrap the wire around the excess over the beads, and trim then ends. I wrap it with my fingers until I get close, clip off the excess, then use the needle nose pliers to crimp down the end of the wire securely.
The look neat and are very secure this way. I use this method for making charms for all sort of things.
When you are picking the beads for your cell phone charm, remember to make sure the holes aren't so big they just slip off the headpin, if they are, you can use spacer beads, end caps, or smaller beads at the end of the wire to keep the bead you want for your main bead secure.
A cluster of charms in similar beads is what I chose for my phone. I like the sparkle and pink is one of my favorite colors.