My 9 year old doesn't have much freedom to be honest, but he has slight SEN and I can't trust him to always look when crossing roads so, as I have told him, until I can trust him to do that he can't go anywhere on his own. A few kids in his year go to and from school alone but we live quite a bit further away than most so I doubt I'd allow it yet even if he was super sensible/careful.
The most he's allowed to do is cycle or scoot up and down the pavement of our street, which is about 20 terraced houses long. But only when I'm in the living room keeping half an eye on him riding past the window each way.
However, when we're out at fun days etc I can trust him now to stay in a certain area so let him have a bit of freedom without me trailing him everywhere. For example, there was a fun day at the local sports centre recently with activities in the sports hall and outside on the big sports pitch. Some of the time I was inside watching his younger brother do a sport while he was outside, out of my sight, doing a different one.
He's been going to the men's toilets by himself when we're out since he was 8 though I do usually hover nearby and there are certain ones we avoid, such as the ones in the local bus station as I've heard bad things about the type of people who hang around the station.
He doesn't have a phone or tablet, but has a Nintendo 2DS, a shared PlayStation 3 and is allowed on the family computer. I am quite strict about which websites he goes on though - only ones he's asked me about and I've looked at. We have parental settings on but I'm still terrified he'll stumble onto porn or something by accident! He's only allowed to watch U or PG films and I say no to some PG films even as I don't think he'd understand them yet.
If we've run out of bread or something I need urgently I will leave him and his brother (aged 8) in the house while I nip to the local shop. But the local shop is literally a one minute walk away and I rush there and back. I wouldn't feel confident to leave him in the house for any real length of time.