Is it normal to keep your ex's phone number?
Yep.Totally normal
Yes, it’s normal to keep an ex’s phone number, whether you might need it someday or simply haven’t bothered to delete it. Keeping the number doesn’t automatically mean you still have feelings or plan to get back together.
Lots of people keep an ex’s number out of habit, because they share practical things, or because deleting it feels unnecessary. Others remove it to make moving on easier, especially if seeing their ex’s name tempts them to reach out.
What matters is how it affects you and your current relationships. If keeping the number is harmless, no big deal; if it keeps you stuck or creates secrecy and mistrust with a partner, it may be worth thinking about what boundary would feel right.