A free app for Android, by Merizek Works.
This application was developed to provide members of the Church of England - the ministers, as well as people who are involved in serving during the holy communion - a common place to find guidance from - especially when it comes to service rules.
It contains instructional guidance or information such as: when to sit, when to stand - as some tend to forget that one is supposed to stand during hymns, canticles, chants, as well as the reading of the Gospel in the Holy Eucharist. You will have access to the script during Liturgy - which you can memorize before your service.