The Nokia 3100b is mostly a basic handset, but it sports a speakerphone system. Listed below are some links about it, among which user reviews and a comparison with other similar phones.
Own a Nokia 3100b? Write your own review
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Quotes from the opinions posted on the Nokia 3100b user review page:
More User Comments
* The system to determine Nokia 3100b ringtones compatibility linked above uses common knowledge on Nokia phones to evaluate your chance of getting free Nokia 3100b ringtones, but it is not absolutely accurate.
Nokia 3100b Specifications And Features
Basics:
Weight: 3.5 ounces
Dimensions: 4.3 x 10.2 x 1.9
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Frequency Band(s): 850/1800/1900
Technologies:
Cellular System: GSM,GPRS
Downloadable Applications Format: J2ME
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Telephony Features:
Built-in Speakerphone: yes
Call transfer: yes
Silent or Vibrating alerts: yes
Memory:
Phone Book Entries: 300
Display:
Color Display: yes
(4,096)
Display Technology: STN
Display Resolution: 128 x 128
Customization:
Custom Ringtones: may not be free
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Custom Graphics: wallpaper
Changeable Faceplates/Covers: yes
Communications:
wap: yes
Wireless Data Protocol: GPRS
Entertainment:
Included Games: games
Photos And Video:
Music:
Messaging:
Predictive text input: T9
SMS: yes
MMS: yes
EMS: yes
Picture messaging: yes
Tools:
Calculator: yes
Voice Memo/Sound Recorder: yes
Alarm clock: yes
Accessibility:
Battery Performance:
Stand-by Time:288 hours
Talk Time:240 minutes
Battery Type: Li-Ion
Battery Power: 850 mAh
Other Features:
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** These Nokia 3100b specifications can not be guaranteed accurate. Before buying a phone, please double check the availability of any feature that is important to you on the manufacturer's web site.


