This scam has been going on, FOR decades, on the phone.
The first one we got, was early in the morning, my grand was in the lower grades, the voice of the phone was that of an adult. The kiddo was in school, didn't have an A PARENT? iPhone, and this was very obviously a SCAM, from the first "HELLO"!
If you ever get such a call, WHY ISN'T YOUR SUPPOSED GRANDCHILD CALLING A PARENT; WHY YOU?
And look at the phone #!
If the call is on your cell phone, you WILL be told it's a SCAM.
"I can't reach Mom or Dad! Maybe they have no cell phone coverage wherever they are."
"I called home and left a message hours ago! No one will pick up! I'm worried about Mom and Dad, but I gotta get out of jail (on a trumped-up charge) first!"
"The police confiscated my mobile phone / my battery is dead! I'm standing here in a holding area, and a friendly stranger is letting me use his phone!"
Regards,
"Hi, you don't know me, but I'm a friend of 'little Johnny' / 'little Mary' and he/she is sitting in jail right now. They confiscated his/her phone, so he/she asked me to call you and ask for bail money!"
Doesn't even require imitating the voice of the victim's alleged grandson/granddaughter!
If I were a scammer, I wouldn't even mention the police - say instead that the grandson/granddaughter was accused of shoplifting (untrue, of course!) and is currently being held by store security. "If you could pay (Venmo?) the $15 for the item he/she allegedly stole, the store manager says they'll forget the whole thing. Problem is, your grandson/granddaughter can't pay himself/herself - for technical reasons."
Regards,