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A1 Alpha 21 - My phone cant connect to a network or No service is displayed

A1 Alpha 21
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Invalid SIM card
Make sure that the SIM card has been correctly inserted.
Make sure that the chip on your SIM card is not damaged.
Make sure that the service of your SIM card is available.
My phone can't make outgoing calls
Make sure that you have dialled a valid number and have touched
.
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 operator (credit, SIM card valid, etc.).
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 operator (credit, SIM card valid, etc.).
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 callers name/number doesn't appear when a call is received
Check that you have subscribed to this service with your operator.
Your caller may have concealed his name or number.
I can't find my contacts
Make sure that your SIM card is not broken.
Make sure that your SIM card is inserted properly.
The sound quality of the calls is poor
Adjust the volume during a call by pressing the Volume key.
Check the network strength. Move to a location with stronger signal strength.
Make sure that the receiver, connector and speaker on your phone are clean.
I can't use the features described in the manual
Check with your operator to make sure that your subscription includes this
service.
Make sure that this feature doesn't require an accessory.
When I select a number from my contacts, the number can't be dialled
Make sure that you have correctly recorded the number in your contacts.
Make sure that you have selected the country code when calling an international
number.
I can't add a contact
Make sure that your SIM card contacts are not full; delete some contacts or
save the contacts to the phone.
My callers can't leave messages on my voicemail
Contact your network operator to check service availability.
I can't access my voicemail
Make sure that your operator’s voicemail number is correctly entered in
"Voicemail number".
Try later if the network is busy.
I can't send and receive MMS
Check your phone storage as it might be full.
Contact your network operator to check service availability and MMS parameters.
Verify the server centre number or your MMS profile with your operator.
The server centre may be swamped. Try again later.
SIM card PIN locked
Contact your network operator to obtain the PUK (Personal Unblocking Key)
code.

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