The 2 android permissions concern the push notifications. “Read phone calls” permission is due to the notification sdk which is asking the phone id. It’s not concerning at all phone calls but phone calls management and phone id retrieving is under the same permission “READ_PHONE _STATE” ( -> “Read phone calls” on your phone).
An anonymous account is created in order to avoid in-app purchases frauds and to provide in-game informations to the player (for example, a recommendation to upgrade the game to the latest version).