Microsoft Lumia 640 LTE vs O2 XDA Comet

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.

• Width

  XDA Comet: 14.2 mm narrower

  Lumia 640 LTE:

  72.2 mm

  XDA Comet:

  58 mm

• Screen diagonal

  XDA Comet: 2.3 in smaller diagonal

  Lumia 640 LTE:

  5 in

  XDA Comet:

  2.7 in

• Depth

  Lumia 640 LTE: 10.2 mm thinner

  Lumia 640 LTE:

  8.8 mm

  XDA Comet:

  19 mm

• Height

  XDA Comet: 35.3 mm shorter

  Lumia 640 LTE:

  141.3 mm

  XDA Comet:

  106 mm

• Release year

  Lumia 640 LTE:

  2015

  XDA Comet:

  2007

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. Lumia 640 LTE

   Height:

   141.3 mm +35.3 mm versus XDA Comet

   Width:

   72.2 mm +14.2 mm versus XDA Comet

   Depth:

   8.8 mm

2. 2. XDA Comet

   Height:

   106 mm

   Width:

   58 mm

   Depth:

   19 mm +10.2 mm versus Lumia 640 LTE

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. Lumia 640 LTE

   Screen diagonal:

   5 in

   Aspect ratio (height:width):

   16:9

   Approximate rectangular screen area:

   68.9 cm²

2. 2. XDA Comet

   Screen diagonal:

   2.7 in

   Aspect ratio (height:width):

   4:3

   Approximate rectangular screen area:

   22.6 cm²

Lumia 640 LTE has approximately 205.3% more rectangular screen area than XDA Comet.

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.

Practical features

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

Battery capacity

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

At least two unambiguous positive capacity values are needed for a chart. Original entries remain in the 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.