O2 XDA Trion vs vivo X21 UD

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 Trion: 16.8 mm narrower

  XDA Trion:

  58 mm

  X21 UD:

  74.8 mm

• Screen diagonal

  XDA Trion: 3.48 in smaller diagonal

  XDA Trion:

  2.8 in

  X21 UD:

  6.28 in

• Rear camera layout

  XDA Trion:

  Single

  X21 UD:

  Dual

• Depth

  X21 UD: 14.6 mm thinner

  XDA Trion:

  22 mm

  X21 UD:

  7.4 mm

• Height

  XDA Trion: 41.5 mm shorter

  XDA Trion:

  113 mm

  X21 UD:

  154.5 mm

• Release year

  XDA Trion:

  2006

  X21 UD:

  2018

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. XDA Trion

   Height:

   113 mm

   Width:

   58 mm

   Depth:

   22 mm +14.6 mm versus X21 UD

2. 2. X21 UD

   Height:

   154.5 mm +41.5 mm versus XDA Trion

   Width:

   74.8 mm +16.8 mm versus XDA Trion

   Depth:

   7.4 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. XDA Trion

   Screen diagonal:

   2.8 in

   Aspect ratio (height:width):

   4:3

   Approximate rectangular screen area:

   24.3 cm²

2. 2. X21 UD

   Screen diagonal:

   6.28 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   98.4 cm²

X21 UD has approximately 305.4% more rectangular screen area than XDA Trion.

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.