Finally restored my father's Ericssons; PF768, T10s & T18s! They're now fully working, with batteries that can keep them powered for a couple of days! Special thanks to u/MLP_George for helping me
Ericsson T28 - Wikipedia
1999 ERICSSON T10s JUICY BLUE ORIGINAL UNIQUE + BATTERY NEW ACCESSORIES BOX | eBay
Sony Ericsson T10S Battery - EMT Company – emtcompany.com
I just restored in working condition my father's Ericsson T10s! It has a custom black shell (hence the “T10sc” label) and it's certainly used, but in very fair condition for its age. : r/vintagemobilephones
Ericsson T10s | Budget GSM Phone | 1999 | ring tones and test call - YouTube