Sonim XP7 vs vivo X21

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

  X21: 133.8 g lighter

  XP7:

  290 g

  X21:

  156.2 g

• Width

  XP7: 2.7 mm narrower

  XP7:

  72.1 mm

  X21:

  74.8 mm

• Screen diagonal

  XP7: 2.28 in smaller diagonal

  XP7:

  4 in

  X21:

  6.28 in

• Chipset

  XP7:

  Qualcomm MSM8926 Snapdragon 400 (28 nm)

  X21:

  Qualcomm SDM660 Snapdragon 660 (14 nm)

• Rear camera layout

  XP7:

  Single

  X21:

  Dual

• Depth

  X21: 13.4 mm thinner

  XP7:

  20.8 mm

  X21:

  7.4 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. XP7

   Height:

   137 mm

   Width:

   72.1 mm

   Depth:

   20.8 mm +13.4 mm versus X21

2. 2. X21

   Height:

   154.5 mm +17.5 mm versus XP7

   Width:

   74.8 mm +2.7 mm versus XP7

   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. XP7

   Screen diagonal:

   4 in

   Aspect ratio (height:width):

   5:3

   Approximate rectangular screen area:

   45.5 cm²

2. 2. X21

   Screen diagonal:

   6.28 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   98.4 cm²

X21 has approximately 116.2% more rectangular screen area than XP7.

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.