CHECKUNO / FIELD NOTES

One phone. Better questions.

Practical checklists that explain what to try, what to look for, and what a result can actually tell you.

Use solid colors to inspect visible pixel issues, tint and display uniformity, then separate screen symptoms from software and accessories.

Draw across a touch canvas, repeat missed areas and isolate accessory or software interference before assuming hardware damage.

Compare a short voice recording, camera clips and call behavior while checking permissions and audio routing.

Inspect account status, physical condition and everyday hardware before agreeing to buy a used iPhone.