I always have my cellphone with me. My job calls me ALL DAY long from 5am until 11pm. It's pretty much a requirement that I at least have it on vibrate so that I know if there's a call. I do not talk on my cell at the dinner table or in the company of others unless it's work or if a family member calls. When it's family, I call them back. I believe it is rude to talk on the phone when you are in the company of others - especially if it is idle chit chat or making plans for the day.
The worlds alternative to talking on the phone is texting. I hate talking on the phone, so I text if I need to say something. BUT I won't handle serious conversations over text or text continuously while in the company of others. I do believe this is just as rude as talking on the phone. If you are going to be in the company of real people, at least give them your attention. I have some friends that can be in a room of twenty and will text for an hour instead of talking to the people in the room with them. If the person on the receiving end of these texts is so important, you need to leave and go spend time with them. I generally try to ignore incoming texts when I am in the company of others. My phone can sit beside me and vibrate but I know it's not work so it's not an emergency. If someone needs to tell me something vital, they know to call me.
Now that Mel is away, I hardly use the phone. I text 2-3 people on a regular basis and I talk on the phone to my mom and work. The phone doesn't get that much attention. I actually like it. While Mel and I were doing long distance when I lived in Michigan, I was always talking or texting. Once I moved here, the phone was hardly ever used. I believe a person needs to have that independence from their partner to be able to hangout with others and not be constantly connected through texting. You have a life of your own, enjoy it. Sometimes it's nice to put all things on hold to handle the here and now with the person you are spending time with. I see my best friend every other day and I can't tell you the last time we had a serious conversation. She's constantly texting and it interrupts the flow of conversation. I can start talking and have to pause so she can text. That is frustrating. I want undivided attention when someone is hanging out with me.. unless it's like a party or something and you can't be one-on-one.
My time is valuable and if I am giving something up for you, at least do the same for me.