Nokia Lumia 638 vs T-Mobile Sidekick 3

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

  Lumia 638: 54 g lighter

  Lumia 638:

  136 g

  Sidekick 3:

  190 g

• Width

  Sidekick 3: 7.7 mm narrower

  Lumia 638:

  66.7 mm

  Sidekick 3:

  59 mm

• Screen diagonal

  Sidekick 3: 1.9 in smaller diagonal

  Lumia 638:

  4.5 in

  Sidekick 3:

  2.6 in

• Depth

  Lumia 638: 12.8 mm thinner

  Lumia 638:

  9.2 mm

  Sidekick 3:

  22 mm

• Release year

  Lumia 638:

  2014

  Sidekick 3:

  2006

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 638

   Height:

   129.5 mm

   Width:

   66.7 mm +7.7 mm versus Sidekick 3

   Depth:

   9.2 mm

2. 2. Sidekick 3

   Height:

   130 mm

   Width:

   59 mm

   Depth:

   22 mm +12.8 mm versus Lumia 638

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 638

   Screen diagonal:

   4.5 in

   Aspect ratio (height:width):

   16:9

   Approximate rectangular screen area:

   55.8 cm²

2. 2. Sidekick 3

   Screen diagonal:

   2.6 in

   Aspect ratio (height:width):

   3:2

   Approximate rectangular screen area:

   20.1 cm²

Lumia 638 has approximately 177.3% more rectangular screen area than Sidekick 3.

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.

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.