The person you need to be 'stricter' with is your controlling abusive H!!
WTF? He tells you when you are allowed to use your phone?!
No. Just no. Forget all about 'communicating' - this isn't even an issue about parenting styles. He is abusive.
It's not just up to him. If he understood and respected that, like a non-abusive person who doesn't assume he gets to be in charge of what his partner does, as if shes another child too, this wouldn't be happening.
You would have discussed the screen time thing. You would have said 'No, I don't agree. I'm with the children more than you and when I'm with them that won't suit me.'
And the thought that he would even think to tell you when you can go on your own phone-!
Yes you do need to communicate. You need to get your courage together and communicate to him that you have had enough. It ISN'T up to him to set rules and he is not the boss of the family or of you. If he cannot a. start respecting your right to decide too, and stop being a controlling aggressive angry shit to his children then you will split.
As an aside. His rules also sound particularly miserable, joyless, regimented, for no reason - as if he just enjoys controlling people, rather than the reason for the rules being the smooth running of everything. No tv before 5. A rule like that, on holiday? With your own children? When it should be about ease, relaxing, fun?
He's just nasty by the sound of it. He doesn't strive to make them happy, he strives to make them obey. It gives him pleasure.
So when you think of splitting, think about the effects of them living in a home like that all through their childhoods, or one balanced with a happier, more relaxed home where people have their wishes listened to, where peace reigns not because of some iron fist in the background but because people enjoy one another's company and are happy to work together.
Better two homes where they are shown that the way this dictator wants things to be is wrong.