T-Mobile Sidekick vs Yezz Billy 4

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

  Billy 4: 19 g lighter

  Sidekick:

  128 g

  Billy 4:

  109 g

• Width

  Sidekick: 6.4 mm narrower

  Sidekick:

  58 mm

  Billy 4:

  64.4 mm

• Screen diagonal

  Sidekick: 1.4 in smaller diagonal

  Sidekick:

  2.6 in

  Billy 4:

  4 in

• Depth

  Billy 4: 8.1 mm thinner

  Sidekick:

  18 mm

  Billy 4:

  9.9 mm

• Height

  Sidekick: 3.5 mm shorter

  Sidekick:

  119 mm

  Billy 4:

  122.5 mm

• Release year

  Sidekick:

  2008

  Billy 4:

  2014

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. Sidekick

   Height:

   119 mm

   Width:

   58 mm

   Depth:

   18 mm +8.1 mm versus Billy 4

2. 2. Billy 4

   Height:

   122.5 mm +3.5 mm versus Sidekick

   Width:

   64.4 mm +6.4 mm versus Sidekick

   Depth:

   9.9 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. Sidekick

   Screen diagonal:

   2.6 in

   Aspect ratio (height:width):

   5:3

   Approximate rectangular screen area:

   19.2 cm²

2. 2. Billy 4

   Screen diagonal:

   4 in

   Aspect ratio (height:width):

   5:3

   Approximate rectangular screen area:

   45.5 cm²

Billy 4 has approximately 136.7% more rectangular screen area than Sidekick.

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.