Brand: au by KDDI
Category: Mobile Phone
Document Type: Manual
Language: EN
Manual for A5516T
Uploaded: Nov. 21, 2025, 8:51 p.m.
Manual Publish Date: 2005-10-01
Warranty Information
No warranty information is available in the provided manual excerpt.
Cell Phone Basics
Cell Phone Features
Making/Answering Calls: Your cell phone is packed with useful features such as phone book, call history, and manner mode. (Page 26) Limit Mode/Smart Mode: You can select a mode that restricts operation, or a mode that allows simplified operation. (Pages 84, 90) Camera: You can take photos and movie clips and then send them easily by e-mail. (Page 63) Mail: You can send mail to other cell phones and personal computers. (Page 50) EZ Navi: Provides useful positional information services including EZ Navi Walk, Position Search, and Area Message. (Page 78) EZweb: You can download "Chaku-Uta®," and access information sites. (Page 71)Manner Mode and Voice Memo
Manner Mode: Turn off incoming call ring tone and other tones to avoid inconveniencing others. (Page 30) Voice Memo: Record memos when you cannot answer calls. (Page 31)Checking the Power, Signal Strength, and Battery Level
Power: Turn on by holding down the power button. (Page 13) Signal Strength: Indicates signal strength. Cannot talk if out of range. (Page 13) Battery Level: Pay attention to the battery level; low battery may affect functionality. (Page 13)Do not use the cell phone while driving!
Using a cell phone while driving is against the law in Japan. Turn off your cell phone or use Drive Mode. (Page 4, 6)Spam and One-ring Calls
Spam: Set mail filters to reject specific mail. (Page 57) One-ring Calls: Be cautious of calls from unknown numbers that may lead to high charges. (Page 29)Disaster Message Board Service
Register and refer to safety information during disasters via EZweb. (Page 8, 9)Troubleshooting and error codes
| Symptom | Check | Measure | Reference Page |
| Cannot turn on power. | Is the battery pack charged? | Charge the battery pack. | 12 |
|---|---|---|---|
| Did you hold down for at least one second? | Hold down for at least one second. | 13 | |
| Is power turned on? | Hold down for at least one second. | 13 | |
| Cannot make calls. | Is (out of range indicator) displayed? | Move to a location where (out of range indicator) is no longer displayed, and try again. | 13 |
| Is your hand covering the area around the built-in antenna? | Make sure your fingers or any other part of your hand is not touching or covering the area around the built-in antenna. | 13 | |
| Did you enter the phone number starting with the area code? | When making a call to a phone other than a cell phone, you need to enter the area code first even if you are inside the same area. | 26 | |
| Cannot receive calls. | Is (out of range indicator) displayed? | Move to a location where (out of range indicator) is no longer displayed. | 13 |
| Is power turned on? | Hold down for at least one second. | 13 | |
| No response when a key is pressed. | Is power turned on? | Hold down for at least one second. | 13 |
| A warning tone sounds and power turns off. | Is there enough power left in the battery pack? | Charge the battery pack. | 12 |
| Calls are answered automatically. | Is voice memo turned on? | Hold down for at least one second to turn off voice memo. | 31 |
| Cannot hear the other party. | Is the earpiece volume level too low? | During a call, press (0) to increase the earpiece volume. | 36 |
| When making a call, a beeping sound is heard from the earpiece and a connection cannot be established. | Is (out of range indicator) displayed? Or are you in a location where the signal is too weak? | Move to a location where (out of range indicator) is no longer displayed. | 13 |
| Is the wireless line congested or is the phone you are calling busy? | End the call and try again later. | 26 | |
| The incoming indicator flashes but the ring tone does not play. | Is manner mode turned on? | Hold down (side key 2) for at least one second to turn off manner mode. | 30 |
| Is (silent indicator) displayed on the standby screen? | Increase the volume of the incoming call ring tone. | 35 | |
| Cannot charge the battery pack. | Is the Toshiba AC adapter 02 plugged into a power outlet? | Insert the adapter in the power outlet properly. | 12 |