.. that is the question. I was at the church last Sunday and I can't help myself from staring at this lovely teenage lady standing at almost at the back of the church. While the sermon is ongoing, she keeps on using her cellphone and I am guessing she is texting someone or maybe replying a message that she got. It's quite distracting (look I have seen her, lol). One time I also saw a man almost running out of the church because his cellphone is ringing and that made almost everyone noticed him.
In my opinion, you can just turn the volume down so that it will not be distracting to church goers or better yet turn it off for at least 1 hour. I don't think you'll miss a lot if you cut off yourself from your gadget.