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Make sure that you are in a place with network coverage for cellular
data or Wi-Fi internet connection.
Try connecting at a later time or another location.
Invalid SIM card
Make sure that the SIM card has been correctly inserted (see
"Inserting or removing the SIM card").
Make sure that the chip on your SIM card is not damaged.
Make sure that the service of your SIM card matches the network
you're on.
My phone can't make outgoing calls
Make sure that you have dialed a valid number and have touched
Call on your phone.
For international calls, check the country and area codes.
Make sure that your phone is connected to a network, and the
network is not overloaded or unavailable.
Check your subscription status with your carrier.
Make sure that you have not barred outgoing calls.
Make sure that your phone is not in airplane mode.
My phone can't receive incoming calls
Make sure that your phone is switched on and connected to a
network.
Check for overloaded or unavailable network.
Check your subscription status with your carrier.
Make sure that you have not forwarded incoming calls.
Make sure that you have not barred certain calls.
Make sure that your phone is not in airplane mode.
The caller's name/number doesn't appear when a call is received
Check that you have subscribed Caller ID service with your carrier.
Your caller may have concealed his name or number.
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