Nokia N81 vs T-Mobile Sidekick LX

Compare recorded specifications, size and practical differences.

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Key differences

Calculated from recorded specifications using minimum difference thresholds. These are differences, not an overall ranking. For three phones, numeric highlights compare the two extremes.

  • Weight

    N81: 22 g lighter

    N81:
    140 g
    Sidekick LX:
    162 g
  • Width

    N81: 10 mm narrower

    N81:
    50 mm
    Sidekick LX:
    60 mm
  • Screen diagonal

    N81: 0.6 in smaller diagonal

    N81:
    2.4 in
    Sidekick LX:
    3 in
  • Depth

    N81: 4.1 mm thinner

    N81:
    17.9 mm
    Sidekick LX:
    22 mm
  • Height

    N81: 27.5 mm shorter

    N81:
    102 mm
    Sidekick LX:
    129.5 mm

Physical size

Relative size, not calibrated actual size. Front and side outlines share one scale and a bottom baseline. Generic outlines use recorded body dimensions, excluding camera bumps.

  1. 1. N81

    Height:
    102 mm
    Width:
    50 mm
    Depth:
    17.9 mm
  2. 2. Sidekick LX

    Height:
    129.5 mm +27.5 mm versus N81
    Width:
    60 mm +10 mm versus N81
    Depth:
    22 mm +4.1 mm versus N81

Weight

Bars start at zero and share a scale within this chart.

  1. 1. N81

    140 g

  2. 2. Sidekick LX

    162 g

    +22 g versus N81

Screen size

Approximate rectangular screens calculated from recorded diagonal and aspect ratio at one relative scale. Rounded corners and cutouts are not subtracted. These are not phone outlines or calibrated actual sizes.

  1. 1. N81

    Screen diagonal:
    2.4 in
    Aspect ratio (height:width):
    4:3
    Approximate rectangular screen area:
    17.8 cm²
  2. 2. Sidekick LX

    Screen diagonal:
    3 in
    Aspect ratio (height:width):
    5:3
    Approximate rectangular screen area:
    25.6 cm²

Sidekick LX has approximately 43.6% more rectangular screen area than N81.

Memory variants

Each row compares the same storage capacity. Cells show recorded RAM alternatives, not combined maxima. Not recorded does not mean unavailable in every market.

No unambiguous storage/RAM pairings are recorded. See the original specifications below.

N81: Original memory entry

12 MB · 96 MB RAM

Sidekick LX: Original memory entry

64 MB RAM · 64 MB ROM

Practical features

Explicit Yes and No values are shown directly. Qualified or regional records retain their details. Unknown means the record is missing.

1. N81

NFC:
Unknown
Headphone jack:
Yes
Memory card support:
See details microSD · up to 8 GB (dedicated slot) · 2 GB included

2. Sidekick LX

NFC:
Unknown
Headphone jack:
No
Memory card support:
See details microSD (dedicated slot)

Battery capacity

Capacity is not battery life. No endurance test is implied.

Recorded battery capacity

Bars start at zero and share a scale within this chart.

  1. 1. N81

    1050 mAh

  2. 2. Sidekick LX

    1540 mAh

    +490 mAh versus N81

Specifications

Open a section for more detail. On narrow screens, swipe sideways or use Left/Right arrow keys while the table is focused. Unknown means missing data, not No. Recorded zero values are shown as recorded.

1. N812. Sidekick LX

Everyday essentials
Everyday essentials — specifications for N81, Sidekick LX.
SpecificationN81Sidekick LX
Dimensions (HxWxD)
  • 102 Х 50 Х 17.9 mm
  • 129.5 Х 60 Х 22 mm
Weight
  • 140 g
  • 162 g
Technology
  • TFT
  • TFT
Screen size
  • 2.4" inch
  • 3" inch
Screen resolution
  • 240 x 320 px
  • 240 x 400 px
Internal memory Recorded storage / RAM variants. Entries are alternatives, not a combined maximum. Ambiguous formats stay as recorded.
  • 12 MB
  • 96 MB RAM
  • 64 MB RAM
  • 64 MB ROM
Memory card support
  • microSD
  • up to 8 GB (dedicated slot)
  • 2 GB included
  • microSD (dedicated slot)
Battery Capacity is not battery life. No endurance test is implied.
  • 1050 mAh
  • Removable Li-Po
  • 1540 mAh
  • Removable Li-Ion
Operating system OS
  • Symbian OS 9.2
  • Series 60 v3.1 UI
  • Danger OS
Headphone jack
  • Yes
  • No
Display
Display — specifications for N81, Sidekick LX.
SpecificationN81Sidekick LX
Display colors
  • 16M
  • 65K
Screen area
  • 17.8 cm2
  • 25.6 cm2
Screen format
  • 4:3 (height:width)
  • 5:3 (height:width)
Screen to body ratio
  • 35.0%
  • 33.0%
PPI /points per inch/
  • 167 PPI
  • 155 PPI
Camera and Video
Camera and Video — specifications for N81, Sidekick LX.
SpecificationN81Sidekick LX
Rear camera, main
  • 2 MP
  • Single
  • 1.3 MP
  • Single
Camera specs
  • 2 MP
  • 1.3 MP
Functions
  • LED flash
Unknown
Video
  • 320p@15fps
  • Yes
Front camera, selfie
  • 0.3 MP
  • Single
  • 0 MP,
Specifications
  • CIF videocall camera
Unknown
Performance
Performance — specifications for N81, Sidekick LX.
SpecificationN81Sidekick LX
Processor CPU
  • 369 MHz ARM 11
Unknown
General specs
General specs — specifications for N81, Sidekick LX.
SpecificationN81Sidekick LX
Release date
  • 2007
  • August
  • 2007
  • September
Colors
  • Cobalt blue
  • Graphite Grey
  • Black
Historical recorded price Legacy catalogue value; date unknown. Not a current offer.
  • 200 EUR
  • 160 EUR
Battery life
  • Stand by time- Up to 410 h Talking time- Up to 4 h (2G) / 3 h (3G)
  • Stand by time- Up to 96 h Talking time- Up to 6 h 50 min
Communication and Connectivity
Communication and Connectivity — specifications for N81, Sidekick LX.
SpecificationN81Sidekick LX
SIM card
  • Mini-SIM
  • Mini-SIM
Network
  • Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900
Unknown
Speed
  • Yes
  • 384 kbps
Unknown
GPRS
  • Class 10
  • Class 10
Edge
  • Yes
  • Class 10
Wi-Fi
  • Wi-Fi 802.11b/g with UPnP
  • No
GPS
  • No
  • No
USB
  • microUSB 2.0
  • Proprietary
Bluetooth
  • 2.0
  • A2DP
  • 2.0
Harmful irradiation
  • SAR - 0.73 W/kg (head) 0.60 W/kg (body) SAR EU - 0.81 W/kg (head)
  • SAR - 0.40 W/kg (head) 0.46 W/kg (body)
Music and Audio
Music and Audio — specifications for N81, Sidekick LX.
SpecificationN81Sidekick LX
Radio
  • Stereo FM radio
  • No
Others
  • Touch-sensitive Navi wheel
Unknown
Other features
Other features — specifications for N81, Sidekick LX.
SpecificationN81Sidekick LX
Dop
  • MP3/AAC/MP4 player -Predictive text input -Push to talk -Voice dial/memo -Organizer
  • MP3/WMA audio player -MP4 player -Voice memo