Use of digital devices when out/at dinner is always an interesting topic and one my husband and I have juggled with over many years.

We don't allow digital devices at the dining table at home as it's family time.
We do allow our children to take digital devices to a restaurant depending on the situation but there are rules around it.
We don't allow our children to use their devices while the meal is being served/eaten when out and often not beforehand either.
They may be allowed to use the device (note I use the word may as it is not always a given) once they have finished their meal IF the situation is appropriate.
We do often allow them to use the device after they've eaten if it is just the 4 of us at a restaurant so that my husband and I can talk while we finish our meal without the kids constantly interrupting or nagging to leave as meals are one of the few times my husband and I get to have a real chat to each other outside all the other commitments we have going on around us.
If out with friends and other children do not have devices our kids are normally not allowed their devices either (with the odd exception of playing together on the Nintendo Switch when appropriate as it allows multiple players/controllers if the other parents are in agreement if the kids ask). We do prefer our kids to socialise and chat or play, although my son can be paranoid about taking his transformers out with him for fear of loosing them from time to time.
If out with friends whose children are using digital devices we normally allow our kids to use theirs but with the prior restrictions in place in terms of eating meals. We try to encourage some socialisation from our kids with friends children but often it is futile when the other kids are too engrossed in their own devices.

In Hong Kong we constantly fought the idea of the kids having digital devices but it was a lost battle (we did resist until the kids were older) as all the kids and parents we associated with used their devices ALL the time when we would be out and our children would be left out, feel out of place, or teased.
I even got told by a group of mums there I was far too strict because I wouldn't let my son have his ipad while eating. Their kids eyes did not leave their ipads EVERY time we had dinner with them. In one case the son would be fed (!!) by the parent while he watched youtube or played a game which I found utterly outrageous! I find the idea of a child playing a game or watching videos while eating with friends and/or family incredibly rude (regardless of the antisocial behavior) so we never allowed it.

We have also been strict on social media access. Our children aren't allowed social media until they turn 13 and under strict conditions and responsibility. Almost all of their HK friends have had social media accounts since the age of 7/8 so my kids got teased for that but having seen what some of my daughters HK friends have posted on Instagram I am glad we waited as she is far more conscious about how she interacts online. Of course, social media and kids is a whole other topic...

Digital devices have their usefulness. On long haul flights and in airports they are a godsend. Used with limitations and with understanding and supervision they can be fabulous tools for learning and imagination.
They don't replace parenting though and personally I believe in being hands on with understanding what our kids are doing and watching with their devices.
We believe using the devices is a privilege. We also use digital time as a reward which can be a strong motivator.

As for movies, we have been a bit horrified by the behaviour of patrons recently and certain complexes seem to be worse than others so after a couple of bad experiences we tend to go to one particular cinema complex where we find people are generally more "civilised" if the movie we want to see is on there. I feel like an old fuddy duddy saying that but having people constantly chatting with each other or on their phones really detracts from the whole reason for watching in a cinema.