call the customer care and ask the details to find out the service provider a cell phone number
The person who owns the cell has a service provider and they pay a monthly bill for data and calls.
If you are staying with the same carrier, just upgrade your phone with them. If you are changing providers, the new carrier needs to fill out some forms with the old carrier. The magic phrase to use with the new carrier is "number portability"; in the USA, all phone carriers are required to transfer your number from one device or service to another. If you are dropping your wired service, you can even transfer your home phone number to your mobile. Or, if you want to go VOIP, the provider there can transfer the number for you.
It differs by service. Ask your provider.
Assuming the new phone isn't locked to a certain provider all you have to do is to move the sim card from the old phone to the new. If the old phone had the same provider as the new phone even a locked phone usually isn't a problem.
It's impossible unless you take extreme measures like asking the phone company that you want it back. You will likely need to get in touch with your service provider / cell phone company and ask for their help in retrieving the deleted number. Alternatively, if you remember what the number was or who you got the number from, then you could always get in touch with that person / re-enter the number into your phone.
Contact your service provider
You call your service provider and find out what the problem is.
You can obtain a cell phone number lookup service at a cell phone provider like AT&T. Calling the company will allow you to see what you are looking for.
When your cell phone is unlocked, you can use it with any service provider's network. The original service provider will have to unlock the cell phone for you.
You can contact your service provider and ask them to change it.
Contact your service provider
Call your service provider, once the phone is registered they can provide you with this information
The frequency of the phone would depend on the model and the carrier or service provider it runs on. It would not depend on the phone number.
No, the cell phones have to be from the same service provider in order for them to work.
Verizon
If you have call forwarding you can do this. Ask your cell phone provider if this service is available.
Free cell phone tracking online is where you go to a service provider that offers this and type in a phone number. Using satellites, they will locate the phone.