Brand: SIEMENS
Category: Mobile Phone
Document Type: Manual
Language: EN
Manual for M55
Uploaded: April 20, 2026, 8 p.m.
Warranty Information
The manufacturer's Guarantee covers new devices for 24 months against manufacturing and material faults, with wear-and-tear parts covered for six months.
Basic Phone Operations:
- Power: Hold the On/Off/End key to switch the phone on or off.
- Calls: Use the Call key to dial numbers or answer calls. The control keys allow navigation and selection within menus and lists.
- Navigation: Use the control keys (up/down) to scroll through lists and menus, and the center button (Select) to make a selection. Pressing the left control key typically goes back a menu level.
- Standby Mode: When the service provider name is displayed, the phone is in standby mode and ready for use.
- SIM Card: Insert the SIM card into the designated slot with the contact area facing downwards.
- Charging: Connect the charger to the phone and a power outlet. The battery is not fully charged upon delivery.
Troubleshooting and error codes
| Phone does not switch on | Battery is empty | Charge the battery. |
| Cannot make calls | No network signal | Check signal strength, change location. |
| Cannot receive SMS | Incorrect message center number | Check message center settings. |
| SIM card is barred | Incorrect PIN entered too many times | Enter PUK code provided by service provider. |
| No network access | Network issue or SIM card problem | Check SIM card, contact service provider. |