- He could be busy.
- He could be travelling where there is no cell phone service.
- His cell phone battery may have died. Maybe he is travelling and he forgot his charger.
- Maybe he lost his cell phone.
- Maybe he is an undercover operative and he's on a secret mission.
So, if you like him, call him, don't text him.
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
(Please note, we give the best advice we can based on the information given in a post. For better advice, please include the age of all romantic partners.)