BLU J4 vs O2 XDA Serra

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

  J4: 7 g lighter

  J4:

  158 g

  XDA Serra:

  165 g

• Width

  XDA Serra: 21.3 mm narrower

  J4:

  72.3 mm

  XDA Serra:

  51 mm

• Screen diagonal

  XDA Serra: 2.7 in smaller diagonal

  J4:

  5.5 in

  XDA Serra:

  2.8 in

• Depth

  J4: 8.1 mm thinner

  J4:

  10 mm

  XDA Serra:

  18.1 mm

• Height

  XDA Serra: 49 mm shorter

  J4:

  151 mm

  XDA Serra:

  102 mm

• Release year

  J4:

  2019

  XDA Serra:

  2008

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. J4

   Height:

   151 mm +49 mm versus XDA Serra

   Width:

   72.3 mm +21.3 mm versus XDA Serra

   Depth:

   10 mm

2. 2. XDA Serra

   Height:

   102 mm

   Width:

   51 mm

   Depth:

   18.1 mm +8.1 mm versus J4

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. J4

   Screen diagonal:

   5.5 in

   Aspect ratio (height:width):

   18:9

   Approximate rectangular screen area:

   78.1 cm²

2. 2. XDA Serra

   Screen diagonal:

   2.8 in

   Aspect ratio (height:width):

   4:3

   Approximate rectangular screen area:

   24.3 cm²

J4 has approximately 221.5% more rectangular screen area than XDA Serra.

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.