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You enter a wrong APN under settings-general-network-cellular data network (ver 2.0 to current 2.2)
Settings > General > Network > Data Roaming Off
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.
Here's from the N800 Manual: To use a packet switched data service in a cellular network, such as GPRS, select Packet Data. To use a circuit switched data service in a cellular network, such as HSCSD, select Data Call.
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.
High Speed Packet Access, or HSPA, is a cellular network data standard. It is the fastest network speed available using 3G technology as defined by the Global System for Mobile communications Association, or GSMA. HSPA requires compatible hardware in the cellphone and the cell network, so only some phones can use it and only when within suitable cellular coverage.
3G refers to the generation of cellular network technology. I refers mostly to the data transmission over such a network especially for internet access.
internet sharing folder
yes they do unless you add their roaming plan
Publicly.
Yes. You can go to the Apple APP Store on any computer and on your iPhone and on an iPad if it is capable of connecting to an available cellular data network. However, iPods and iPads that are not cellular models will not be able to access the Apple APP Store without a WiFi connection.