Not from the number alone. Three things can locate a phone, and none of them accepts a bare number as input: the phone's operating system (Find My, Google), the carrier account (family locator services), or an app installed on the device.
Quick decision table:
| Situation | Free option | Paid option | |---|---|---| | iPhone, family member agrees | Find My + Family Sharing | none needed | | Android child | Family Link | monitoring app for messages/calls | | Line on your carrier account | carrier family locator | — | | Device you own and administer | Google/Apple account | Ultimate Phone Spy (Android, Windows, Mac) | | Adult who has not consented | none lawful | none lawful |
Accuracy is the other half of the answer: carrier tools are cell-tower based and land within a few hundred meters; GPS is 5–20 meters outdoors and unreliable indoors. If you need to know whether someone arrived somewhere, set a geofence rather than watching a live dot — it uses far less battery and produces fewer false alarms.
Where a monitoring app adds something the free tools cannot is message and call content on a device you administer. Ultimate Phone Spy does that on Android, Windows and Mac (pricing, system requirements); it does not run on iPhone, and no product can, because iOS does not grant that access.
We answered the longer version of this in this thread — the mechanics are the same regardless of which phone the number belongs to.