How do you get a preteen to call grandma on the Sims freeplay?

To get a preteen to call grandma in The Sims FreePlay, first ensure you have both a preteen and an elder sim (grandma) in your game. Select the preteen sim, then tap on the social interaction icon (the speech bubble) and choose the "Call" option. From the list of available contacts, select grandma to initiate the call. Make sure you have completed any necessary quests or tasks that might unlock this interaction.