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Motorola BACKFLIP vs Nokia E51 camera-free

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

      E51 camera-free: 33 g lighter

      BACKFLIP:
      133 g
      E51 camera-free:
      100 g

    • Release year

      BACKFLIP:
      2010
      E51 camera-free:
      2008

    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. BACKFLIP

      Height:
      Unknown
      Width:
      Unknown
      Depth:
      Unknown

      Folded/unfolded dimensions are ambiguous in this record; outlines are omitted.

    2. 2. E51 camera-free

      Height:
      114.8 mm
      Width:
      46 mm
      Depth:
      12 mm

    Weight

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

    1. 1. BACKFLIP

      133 g

      +33 g versus E51 camera-free

    2. 2. E51 camera-free

      100 g

    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.

    At least two phones need compatible screen dimensions for a drawing.

    1. 1. BACKFLIP

      BACKFLIP: Screen geometry unavailable or conflicting.

    2. 2. E51 camera-free

      Screen diagonal:
      2 in
      Aspect ratio (height:width):
      4:3
      Approximate rectangular screen area:
      12.4 cm²

    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.

    BACKFLIP: Original memory entry

    512 MB · 256 MB RAM

    E51 camera-free: Original memory entry

    130 MB · 96 MB RAM

    Practical features

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

    1. BACKFLIP

    NFC:
    Unknown
    Headphone jack:
    Yes
    Memory card support:
    See details microSD · up to 32 GB (dedicated slot) · 2 GB included

    2. E51 camera-free

    NFC:
    Unknown
    Headphone jack:
    No
    Memory card support:
    See details microSD · up to 16 GB (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. BACKFLIP

      1400 mAh

      +350 mAh versus E51 camera-free

    2. 2. E51 camera-free

      1050 mAh

    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. BACKFLIP2. E51 camera-free

    Everyday essentials
    Everyday essentials — specifications for BACKFLIP, E51 camera-free.
    SpecificationBACKFLIPE51 camera-free
    Dimensions (HxWxD)
    • 108 Х 53 Х 15.3 mm
    • 114.8 Х 46 Х 12 mm
    Weight
    • 133 g
    • 100 g
    Technology
    • TFT
    • TFT
    Screen size
    • 3.1" inch
    • 2" inch
    Screen resolution
    • 320 x 480 px
    • 240 x 320 px
    Internal memory Recorded storage / RAM variants. Entries are alternatives, not a combined maximum. Ambiguous formats stay as recorded.
    • 512 MB
    • 256 MB RAM
    • 130 MB
    • 96 MB RAM
    Memory card support
    • microSD
    • up to 32 GB (dedicated slot)
    • 2 GB included
    • microSD
    • up to 16 GB (dedicated slot)
    Battery Capacity is not battery life. No endurance test is implied.
    • 1400 mAh
    • Removable Li-Ion
    • 1050 mAh
    • Removable Li-Ion
    Operating system OS
    • Android 1.5 (Cupcake)
    • upgradable to 2.1 (Eclair) in USA
    • Symbian OS 9.2
    • Series 60 v3.1 UI
    Chipset
    • Qualcomm MSM7201A
    		 Unknown
    Headphone jack
    • Yes
    • No
    Display
    Display — specifications for BACKFLIP, E51 camera-free.
    SpecificationBACKFLIPE51 camera-free
    Touchscreen
    • capacitive touchscreen
    		 Unknown
    Display colors Unknown
    • 16M
    Screen area
    • 28.6 cm2
    • 12.4 cm2
    Screen format
    • 3:2 (height:width)
    • 4:3 (height:width)
    Screen to body ratio
    • 50.0%
    • 23.5%
    PPI /points per inch/
    • 186 PPI
    • 200 PPI
    Screen protection
    • Corning Gorilla Glass
    		 Unknown
    Camera and Video
    Camera and Video — specifications for BACKFLIP, E51 camera-free.
    SpecificationBACKFLIPE51 camera-free
    Rear camera, main
    • 5 MP
    • Single
    • 0 MP,
    Camera specs
    • 5 MP
    • AF
    		 Unknown
    Functions
    • LED flash
    		 Unknown
    Video
    • CIF@30fps
    		 Unknown
    Front camera, selfie
    • 0 MP,
    • 0 MP,
    Performance
    Performance — specifications for BACKFLIP, E51 camera-free.
    SpecificationBACKFLIPE51 camera-free
    Processor CPU
    • 528 MHz ARM 11
    • 369 MHz ARM 11
    Graphics processor GPU
    • Adreno 130
    		 Unknown
    General specs
    General specs — specifications for BACKFLIP, E51 camera-free.
    SpecificationBACKFLIPE51 camera-free
    Release date
    • 2010
    • January
    • 2008
    • February
    Colors
    • Platinum Silver
    • Black
    • Silver
    Historical recorded price Legacy catalogue value; date unknown. Not a current offer.
    • 150 EUR
    • 130 EUR
    Battery life
    • Stand by time- Up to 315 h Talking time- Up to 6 h
    • Stand by time- Up to 310 h Talking time- Up to 4 h 20 min
    Communication and Connectivity
    Communication and Connectivity — specifications for BACKFLIP, E51 camera-free.
    SpecificationBACKFLIPE51 camera-free
    SIM card
    • Mini-SIM
    • Mini-SIM
    Network
    • Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900
    • Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900
    Speed
    • HSPA 7.2/0.384 Mbps
    • HSPA 3.6/0.384 Mbps
    GPRS
    • Class 12
    • Class 32
    Edge
    • Class 12
    • Class 32
    Wi-Fi
    • Wi-Fi 802.11 b/g
    • Wi-Fi 802.11b/g
    • VoIP over WLAN
    GPS
    • Yes
    • with A-GPS
    • No
    USB
    • microUSB 2.0
    • miniUSB 2.0
    Bluetooth
    • 2.1
    • A2DP
    • 2.0
    • A2DP
    Harmful irradiation
    • SAR - 0.58 W/kg (head) 0.60 W/kg (body)
    • SAR - 1.47 W/kg (head) 0.75 W/kg (body) SAR EU - 1.38 W/kg (head)
    Music and Audio
    Music and Audio — specifications for BACKFLIP, E51 camera-free.
    SpecificationBACKFLIPE51 camera-free
    Radio
    • No
    • FM radio
    Others
    • Active noise cancellation with dedicated mic
    • Five-way scroll key -Downloadable themes
    Other features
    Other features — specifications for BACKFLIP, E51 camera-free.
    SpecificationBACKFLIPE51 camera-free
    Dop
    • Sensors Accelerometer
    • proximity
    • compass - MP3/eAAC+/WAV/WMA9 player -MP4/H.264/WMV9 player -Organizer -Document viewer -Voice memo/dial -Predictive text input - BACKTRACK touch panel - Also known as Motorola Enzo
    • Motorola Motus
    • Motorola MB300
    • Infrared port - Push to talk -WMV/RV/MP4/3GP player -MP3/WMA/WAV/RA/AAC/M4A player -Document viewer -Predictive text input -Voice command/memo -Organizer -Nokia Intellisync Wireless Email -Exchange mail