Z750a_UG_AT&T_P1C_AE.book Page 53 Wednesday, September 12, 2007 8:18 AM

The phone does not ring or rings too softly

Make sure the microphone has not been muted. See “To mute the microphone during a call” on page 16.

Check the ringtone volume. See “To set the ringtone volume” on page 37.

Check the profile. See “To select a profile” on page 49.

Check the Forward call options. See “To forward calls” on page 23.

Error messages

Insert SmartChip

There is no SmartChip in your phone or you may have inserted it incorrectly.

See Charging the battery on page 7.

The SmartChip connectors need cleaning. If the card is damaged, contact AT&T.

Insert correct SmartChip

Your phone is set to work only with certain Smartchips. Check if you are using an AT&T SmartChip.

Wrong PIN/Wrong PIN2

You have entered your PIN or PIN2 incorrectly.

Enter the correct PIN or PIN2 and select Yes. See To insert the SmartChip on page 5.

PIN blocked/PIN2 blocked

You have entered your PIN or PIN2 code incorrectly three times in a row.

To unblock, see SmartChip lock on page 50.

Codes do not match

Codes that you have entered do not match. When you want to change a security code, for example your PIN, you have to confirm the new code.

See SmartChip lock on page 50.

No netw. coverage

Your phone is in flight mode. See Flight mode on page 6.

Your phone is not receiving any network signal, or the received signal is too weak. Contact AT&T and make sure that the network has coverage where you are.

Troubleshooting 53

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Sony Ericsson Z750a manual Error messages