Brand: SIEMENS
Category: Mobile Phone
Document Type: Manual
Language: EN
Manual for C55
Uploaded: Nov. 21, 2025, 7:40 p.m.
Warranty Information
Warranty information is not explicitly stated in the provided manual excerpt.
Getting Started
The phone can be customized with different covers and keypads. To insert SIM card/battery, first switch off the phone. Press the grooved area to lift the cover, then insert the SIM card with contacts downwards. Insert the battery sideways and press down. Replace the cover.
Charging the Battery
Plug the charger cable into the bottom of the phone and the power supply unit into the socket. Charge for at least two hours. The battery is fully charged after about 2 hours. Use only the provided charger.
Switching On/Off and PIN Entry
Hold down the On/Off/End key to switch the phone on or off. The SIM card can be protected with a 4-8 digit PIN. Enter the PIN using the number keys. Press the control key on the right to confirm.
Security Features
The phone and SIM card are protected by PIN, PIN2, PUK/PUK2, and Phone code. Keep these confidential numbers safe. You can change the PIN and PIN2. Clear SIM card barring if the PIN is entered incorrectly three times.
Troubleshooting and error codes
| Question | Possible causes | Possible solution |
|---|---|---|
| No connection to network. | Signal weak. Outside GSM range. SIM card not valid. New network not authorised. Network barring is set. Network overloaded. | Move higher, to a window or open space. Check service provider coverage map. Contact the service provider. Try manual selection or select a different network (p. 70). Check barrings (p. 69). Try again later. |
| Phone loses network. | Signal too weak. | Reconnection to another service provider is automatic (p. 70). Switching the phone off and on may speed this up. |
| Calls not possible. | 2nd line set. New SIM card inserted. Charge limit reached. Credit used up. | Set line 1 1 (p. 70). Check for new restrictions. Reset limit with PIN 2 (p. 28). Load credit. |
| Certain uses of the phone not possible. | Call restrictions are set. | Barrings may be set by your service provider. Check barrings (p. 69). |
| No entries possible in Phonebook. | Phonebook is full. | Delete entries in Phonebook (p. 21). |
| Voice mail does not work | Call divert to the mailbox not set. | Set call divert to the mailbox (p. 60). |
| SMS (message) flashes. | SMS memory full. | Delete messages (SMS), (p. 30) or store them in the archive (p. 31) to make room. |
| Function cannot be set. | Not supported by service provider or registration required. | Contact your service provider. |
| Memory problems with Games&More, ring tones, pictures, SMS archive. | Phone memory full. | Delete files where necessary. |
| No WAP access, no HTTP download possible. | Profile not activated, profile settings wrong/incomplete. | Activate WAP profile (p. 36), check settings (p. 64) and activate HTTP profile (p. 39), check settings (p. 65). If necessary consult your service provider. |
| Message cannot be sent. | Some service providers do not support this service. Phone number of the service centre is not set or is wrong. SIM card contract does not support this service. Service centre overloaded. Recipient does not have a compatible phone. | Check with your service provider. Set service centre (p. 66). Contact your service provider. Repeat message. Check. |
| EMS pictures&sounds are not displayed at the destination phone | The destination phone does not support the EMS standard. | |
| No Internet access possible. | Wrong WAP profile set or settings wrong, incomplete. | Check settings, if necessary consult your service provider. |
| PIN error / PIN2 error. | Three wrong entries. | Enter the PUK (MASTER PIN) provided with the SIM card according to the instructions. If the PUK (MASTER PIN) has been lost, contact your service provider. |
| Phone code error. | Three wrong entries. | Contact Siemens Service (p. 88). |
| Service provider code error. | No authorisation for this service. | Contact your service provider. |
| Too few/too many menu entries. | Functions may have been added or removed by your service provider via the SIM card. | Check with your service provider. |
| No fax possible. | Incorrect settings in the PC. No authorisation for this service. | Check settings (p. 67). Contact your service provider. |
| Charge counter does not work. | Charge pulse not transmitted. | Contact your service provider. |
| Damage | Severe shock. | Remove battery and SIM and insert them again. Do not dismantle phone! |
| Damage | Phone became wet. | Remove battery and SIM card. Dry immediately with cloth, do not heat. Dry connector contacts thoroughly. Stand unit upright in an air current. Do not dismantle phone! |