In the time you write about, 25 years ago, when the Nokia 5110 was current, it was prestigious to have a mobile phone and only those who needed it for work or those whose parents could afford $1000 or more had it.
The first Nokia that I held in my hands and spoke from it (take a look at my post, there is a picture), it cost with a SIM card about 10000DM (German mark, later replaced with 1/2 Euro), which means about $5000. That phone was owned by my friend's father, the owner of a private company... At that time children aged 5-15 certainly could not have this gadget.
And they didn't even need it, who would they call with it when it wasn't in mass use. And there were no other games on it besides "Snakes"🙂