| NETWORK |
 M550 - Dual band E-GSM 900/1800
M551 - Dual band GSM 850/1900 with AMR
Automatic switching between bands
Manual and automatic network selection
HR / FR / EFR Codec for GSM 900 / 1800
CSD 14.4kbps (browsing, media only)
|
| GAMES |
Great games for colour screens including Ten Pin , KombatClub and Splat!
|
| POWER MANAGEMENT |
Battery type: Lithium-ion
Charging time 2 hrs
Game-play = up to 3h
|
| DISPLAY |
Display backlit with brilliant white LEDs.
Inner display CSTN colour display with up to 4,096 colours 128 x 128 pixels
Outer display reverse video / mono / 96 x 64 pixels
|
| PHYSICAL CHARACTERISTICS |
Clamshell design
Dual display - internal colour display, black and white external status screen
Exclusive finishing
Inbuilt antenna
Outer bezel available in 6 colours - Blue, Red, Black, Green, Turquoise and Purple
|
| USER INTERFACE |
Customisable operator SIM Toolkit menu graphic
Emergency call 999 & 911 in addition to 112 (Programmable)
Event animations (e.g. SMS sent)
Full screen graphics for top level menus
Menu based interface with two context dependant soft keys
Multi-tap & symbol input
Network / service provider logo display (instead of name)
Predictive text input for all editing modes (Tegic  ® ) predictive, multitap, numeric and symbol text input modes
Programmable hotkeys
Real time clock
Selectable input modes
Service provider name display
Up and down keys for menu navigation
User selectable coloured menu themes
Welcome and goodbye animations
|
| KEYPAD |
Hard key with chromed accent on function keys
Keypad backlit with green LEDs
Latin, Chinese, BoPoMoFo, Hebrew, Arabic and Russian
Programmable function key with quick access to a specific menu or service
|
| SECURITY |
PIN on / off / change
PIN2 management
SIM lock (network lock, network subset lock, service provider lock, corporate lock, personalised lock)
|
| TEXT MESSAGING |
Call SMS sender’s number
EMS v5 - support to up to 64 x 64 pixels
Extra memory for up to 10 SMS
Nokia Smart Messaging receive only (ringtones, CLI & operator logos)
Predictive text input for all editing modes (Tegic ® ) predictive, multitap, numeric and symbol text input modes
Receive up to 6 concatenated SMS messages
Save senders phone number or embedded number in a message to phonebook
Send message status report
Short message service cell broadcast (SMS CB) single and multipage
SIM memory status
SMS MO / MT - Send & receive text messages up to 160 characters
SMS reply and forward
Up to 10 predefined SMS messages in a European language
|
| PHONEBOOK / CALL MANAGEMENT |
Active flip, automatic call answering / ending when opening the flip
Alphabetic phonebook with search function
Any key answer
Auto redial
Call list (missed / redial / reply) with up to 30 entries (maximum of 10 each of missed, dialled and received)
Call time indication in call
Call time/cost display at end of call
NB: The actual invoice for calls and services from your service provider may vary depending on network features, rounding-off for billing, taxes and so forth.
Call timers: total outgoing, total incoming and reset
Last call information
Name / number association for incoming calls / SMS with default phonebook
Own number read from SIM
Phonebook on the SIM card (quantity SIM dependent), user-selectable
Silence the phone on incoming call
Up to 500 phonebook entries in phone
User determined user Busy (incoming call reject)
Voice mailbox number read from SIM (SIM dependant)
Voicemail short cut key
|
| OTA DOWNLOAD FEATURES |
Nokia Smart Messaging
Icons - displayed on the main screen
CLI and Operator icons
Ringtones
EMS i melody
SP midi via EMS
Polyphonic ringtones SMAF (Yamaha format) via WAP
|
| RINGTONE |
Send SP midi and melody ringtones via EMS
Up to 16 voice polyphonic
Up to 25 (15 fixed + 10) polyphonic SMAF format, I-melody or SP-midi
|
| IN-CALL FUNCTIONS |
Consult and edit phonebook
Graphic earpiece volume indicator
Hold / release
Mute on / off
Scratchpad
Send DTMF (from phonebook or keypad)
Send SMS
Spending limits menu
|
| NETWORK SERVICES / FEATURES |
ADN / FDN / SDN
Advice of Charge (AoC)
Call barring
Call Forwarding Conditional / Unconditional (CFU)
Call waiting / hold
CLIP / CLIR (Line Identification Services)
Conference Call, including private conversation during conference call
CPHS v4.2
Explicit Call Transfer (ECT)
GPRS Class 8
Triple codec: full rate (FR), half rate (HR) and enhanced full rate (EFR)
SIM Toolkit Class 3 release 99 class B and C
Unstructured Supplementary Service Data (USSD) MO / MT / Dialog
|
| SOUNDS & ALERTS |
Alarm clock with snooze (alarm will wake up the phone when switched off) and reminder function
Battery low beep
Credit low beep
Keypad tones (DTMF) on / off
New message tone / melody
New SMS CB tone / melody
Ringer volumes: silent, low, mid, high and ascending
USSD MT beep
Vibrating alert
Welcome and goodbye melody (attached to welcome & shutdown screens)
|
| LANGUAGES |
Many European and Asian languages
Simplified and traditional Chinese menus
|
| WAP |
WTLS class 2 security
WAP 1.2.1 colour browser
WAP settings pre-configurable
Image support for GIF and WBMP
|
| DISPLAY ICONS / INDICATORS |
Alarm on indicator
Call forward unconditional indicator
GPRS attached / coverage indicator
Message list full indicator
Missed call indicator with counter
New SMS MT / CB icon
New voice mail icon
Ringer status indicator (on, silent, vibrate, vibrate / ring)
Signal strength / battery indicator / event icon
|
| OPTIONAL ACCESSORIES |
Car accessories
Cigarette lighter adapter (in-car charger)
Easy car kit Speaker, Microphone and CLA
Mains charger 1.8m cable, versions with Euro, Chinese and UK plugs 220v-240v 50hz, versions with US plugs 110v-120v 60hz
Personal handsfree headsets |
Mobile Phones 
