If a person’s kavana is increased by davening from a grandparent’s siddur than that is better. However, the main thing is to see the letters (this is discussed in Nefesh HaChaim). One large advantage of the i-phone application is that special tefillot, such as “yaaleh veyavo” pop up on the proper days so one cannot forget unless he is on automatic pilot, in which case nothing will help.
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