In our shul in London, the Rav Shlita has put up a sign on the Shul’s notice boards that if someone’s phone goes off while they are in Shul, (EXCEPT HATZOLAH!) they must pay 30 pounds sterling to the shul gemach, payable to the Rav Shlita immediately! A few times, phones have rung and the Rav Shlita has collected handsomely for the Gemach!
There is also a picture of a soldier talking on his cell phone with his teffilin on davening during one of the recent wars with a caption, “this is when it is allowed to speak on the phone during davening”!
We should all be zocher to daven with kavana and may all our tefillot be answered le tova imminently!