If you change the network service provider, the internet Access Point Name (APN) settings may be incorrect.
You can use Microsoft SkyDrive as additional storage. For more info, go to https://skydrive.live.com.
In Windows Phone 8, use the Storage Check app to clear several types of temporary files. You can download the Storage Check app from Store.
The blinking closed envelope icon indicates the SIM card message memory is full.
Select Menu > Messaging > Options > (View folders > Options) > SIM messages and delete one or more SMS messages.
Note 1: Class 2 messages (for example, service messages from operators) are stored in the SIM card message memory. Once the SIM card message memory is full, Class 2 messages can't be received.
Note 2: You have used a Nokia S40 product before. In S40 products the SIM card message memory is filled before the device message memory. If you insert a SIM card with full message memory to another device, a blinking message icon appears on the display of your Nokia device.
Note 3: Other reason could be that there is not enough free memory available on the device to store the new message. To release a space go to Messaging > Inbox and remove unnecessary messages
If you cannot connect the headset to the compatible phone, proceed as follows:
If your memory card or mass memory is not working properly, check the following:
If the memory card or mass memory is not working properly, try backing up any data from your device's memory card or mass memory to your PC, then format the memory card or mass memory by using your Nokia device. Depending on your device, the memory card can usually be formatted in one of the following applications (select the application, open the desired memory device and in the available options select the command to format the memory card or mass memory):
Refer to your device's user guide for more information on how to format the memory card or mass memory.
If you get an error message during the formatting process or an error message after formatting stating that your device cannot read the memory card volume or mass memory, take the memory card or Nokia device (in case you have internal mass memory in your device) to your nearest Nokia care point.
Warning: Formatting your memory card or mass memory will permanently erase all data stored on the memory card or mass memory. Please back up all data stored on your memory card or mass memory before formatting.
Important: The memory card or mass memory inside your Nokia device should ONLY be formatted using your Nokia device. Do not attempt to format your memory card on another device such as a PC, otherwise your memory card may not work properly.
The calling phone number may not match with a contact name and the name is not shown in the following situations when an incoming call or SMS arrives:
If the problem persists, make sure your Nokia device is running the latest software. For downloads and assistance, go to your local Nokia website.