Samsung i637 Jack vs vivo X21i

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

  i637 Jack: 56.9 g lighter

  i637 Jack:

  102.1 g

  X21i:

  159 g

• Width

  i637 Jack: 14 mm narrower

  i637 Jack:

  61 mm

  X21i:

  75 mm

• Screen diagonal

  i637 Jack: 3.88 in smaller diagonal

  i637 Jack:

  2.4 in

  X21i:

  6.28 in

• Rear camera layout

  i637 Jack:

  Single

  X21i:

  Dual

• Depth

  X21i: 5.7 mm thinner

  i637 Jack:

  12.7 mm

  X21i:

  7 mm

• Height

  i637 Jack: 37.4 mm shorter

  i637 Jack:

  117 mm

  X21i:

  154.4 mm

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. i637 Jack

   Height:

   117 mm

   Width:

   61 mm

   Depth:

   12.7 mm +5.7 mm versus X21i

2. 2. X21i

   Height:

   154.4 mm +37.4 mm versus i637 Jack

   Width:

   75 mm +14 mm versus i637 Jack

   Depth:

   7 mm

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. i637 Jack

   Screen diagonal:

   2.4 in

   Aspect ratio (height:width):

   4:3

   Approximate rectangular screen area:

   17.8 cm²

2. 2. X21i

   Screen diagonal:

   6.28 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   98.4 cm²

X21i has approximately 451.9% more rectangular screen area than i637 Jack.

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.

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.