alaskagirl - It sounds to me like you're doing a great job -- what you describe -- your close relationship, talking, and reading together at night -- sounds really solid.
Tween-dom is no walk in the park. I remember when my younger child graduated from 8th grade and feeling so relieved that I never had to go back to middle school ever again (as some of the "stuff" does bring up your own experiences)
I commend you on the phone choice. We did get our daughters very basic phones when they hit 7th grade or so -- with all the extra-curriculars it was easier for me. -- but nether got a smart phone until 16.
I think most importantly that home has to be a safe haven. When they are being pushed to the breaking point by social stuff, or fatigue, or physical stuff just being able to walk in the door and know they are loved goes a long long way. I remembered thinking that they were likely hearing or receiving a lot of negativity and criticism during the day and that they needed me to refrain from any "helpful comments"
Time spent "shoulder to shoulder" (rather than face to face) was usually good talking time -- car rides, walks, etc. I got pretty good at asking the the types of questions that kept the conversation going -- i.e. "what do you think about that"
When they would divulge something disturbing that someone did to someone else, we would talk about how the child perpetrating the nastiness probably didn't "feel good inside their body" or inside their skin. Even at that age they realize that if you feel good and happy and confident, you aren't mean to others. You just aren't. I think it helped them realize that when they were being mean to, uh, me, that it was likely because they weren't feeling good about something that had happened to them. The vicious circle.
I would suggest picking up a copy of Dweck's Mindset. It's a great resource to have during the years where kids are developing a view of themselves - I am someone who is ..... (good at math, bad at sports, etc etc)
ok. long post