Concentrate on 1st Benediction of Amidah.
If we truly believe that we are Davening to Hashem we would always arrive on time at Shul, which by definition for Shacharis means 5 minutes early, so that we have Tallis & Tefillin on before commencement of services, and no cell phone would ever go off in Shul, nor would anyone ever answer a cell phone in Shul.