Is it harmful to not shut down phone (1) for an extended period? July 08, 2022 11:34 Updated By not shutting down for a long time, phone (1) will slow down. This is because junk files are generated whenever the phone is in operation, and over time, this can clog the system. Related articles Does the phone need to be restarted every day? How often should I shut down and restart the phone? What is OTG connection? What is the Bedtime Schedule under the Glyph Interface? What is the Find My Phone feature?