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When data from your current provider is not available, your phone will probably search for another carrier programmed to work on your phone. When the phone picks up another data service that is not your provider, this is called 'data roaming'. Please note that depending on your carrier, you may be charged with data roaming charges. Check with your service provider for more details. Please avoid it unless you are sure about its cost.
One receives roaming charges when the extension of connection is different from the registered location. One will usually receive data roaming from the phone service provider.
Settings > General > Network > Data Roaming Off
yes they do unless you add their roaming plan
Move.
No, only for using the services of the phone.
You will get service, but not 4G LTE speed for data. You will also need to check on the cost of international roaming.
Picking a cell phone plan depends on your usage habits and where you live. Some things you should consider are how many minutes you plan on using your phone for making calls, number of texts you will send, and if you are going to get a smart phone requiring a data plan. Another consideration is if you plan on using the phone in different ranges to decide on coverage's to prevent roaming fees.
A triangle with red inside of it on the toll bar of a smart phone means roaming. This is means that it has little signal and you could get changed if you use your phone when roaming.
roaming
Roaming data means collecting a network or signal from another network provider other than the original signal provider. This is generally used when someone is in abroad.
The best plan will be dependent on the phone service, but common international voice plans can help save about 20% or more on voice calls. If data services are also needed, most providers offer a separate international data roaming plan as well.