Spoiler Alert: The following article has information not currently present in the anime or manga. Do not proceed unless you want to be spoiled.
God first appears in the Divine Realm where he apologizes to Touya for accidentally killing Touya Mochizuki with lightning he threw in a spot that he didn't expect someone to be present. During the talk, God saw that Touya was also a good young man who handled the situation peacefully, which consequently increasing God's guilt for killing him. To compensate the mistake that had done, God stated he would revive Touya but as reviving one's life back to its original world is forbidden, Touya would be reincarnated into a new world instead. God also stated he would granted him any wish that he asked. After some thought, Touya asked God for his smartphone. .
God contacted Touya, congratulating the young man about his fiancés.