I doubt that you know me, nor do I know who you are; however, I do have something to say to you: you were embarrassing at jumu'ah today. You know how crowded it gets at the masjid: SRO, brothers praying on the stairwell landings, praying on a hot tile roof. I was able to get a small place to sit next to you on the second floor just as the sunnah prayer was starting, right after today's khutbah. I did the sunnah prayer but noticed that you didn't - that hand phone of yours seemed more important to you. However, the prayer was, after all, only sunnah, not fard, so I can see why you might not want to do it, even though 99% of your Muslim brothers there were praying.
But then I noticed that you didn't pay attention to the duas being recited by the imam; it was that hand phone of yours again. You were playing Tetris, or some similar game, and I could only shake my head in disgust at you. Not that you noticed. You kept on playing your game until the final adhan. Then you got up like a bolt of lightning and you were all business. Up until this point I had been wondering if you were really a Muslim; I had assumed that you were but you sure weren't behaving like one. But you finished the prayer, shook my hand (which I was tempted not to touch because I was so disgusted with you by this point), and then you were out of there, once more, like the proverbial bolt of lightning.
Dude, we're here to escape from the world at large for a few brief minutes so that we can return our thoughts to our Lord and Creator. Perhaps you need to be reminded of a few ayat from the Qur'an:
(Lit is such a Light) in houses, which Allah hath permitted to be raised to honor; for the celebration, in them, of His name: In them is He glorified in the mornings and in the evenings, (again and again), By men whom neither traffic nor merchandise can divert from the Remembrance of Allah, nor from regular Prayer, nor from the practice of regular Charity: Their (only) fear is for the Day when hearts and eyes will be transformed (in a world wholly new), (24:36-7)
O ye who believe! When the call is proclaimed to prayer on Friday (the Day of Assembly), hasten earnestly to the Remembrance of Allah, and leave off business (and traffic): That is best for you if ye but knew! (62:9)
O ye who believe! Let not your riches or your children divert you from the remembrance of Allah. If any act thus, the loss is their own.
So my gentle advice to you is that, next week, you should put your hand phone away and pray earnestly to Allah (swt) for forgiveness. And if that's too hard, then just stay away from the Masjid so that another Muslim brother can pray on a cool carpeted floor instead of a hot ceiling tile.
Your brother in Islam,