Run a blind side-by-side review with the camera your team uses now before approving the phone. Forum photos can expose obvious weaknesses, but they cannot tell you whether your office staff will get the information they need from a real job.
First, pick several normal documentation tasks from recent work orders. Use actual equipment labels, damaged surfaces, completed repairs, confined areas, and whatever else appears in your reports. Include at least one easy subject and a couple that regularly cause retakes.
Next, have the same field worker photograph each subject with both devices. Keep the conditions realistic. Use the normal case, work gloves, standard camera mode, and the same amount of time they would have on site. Do not let someone spend five minutes perfecting the phone shot if your crew normally has twenty seconds.
Rename the files so the office reviewers do not know which device produced them. Ask simple pass-or-fail questions:
Can you read the identifying information?
Can you see the defect being reported?
Is there enough surrounding context to tell where it is?
Would you accept this image in the final record without requesting another visit?
That last question matters more than sharpness when zoomed to an absurd level. A technically impressive photo still fails if it leaves the reviewer unsure about what they are seeing.
Use a fixed capture sequence too: an overall location shot, a closer view of the work area, then the detail shot. Put a ruler or scale marker beside cracks, gaps, corrosion, or damaged parts when size matters. Phone lenses can make objects near the edge look stretched, so nobody should estimate measurements from the picture alone.
@securedevsync has the right idea about exceptions, but I would write those exceptions as clear triggers rather than broad phrases like “difficult conditions.” For example, require the separate camera when lettering cannot be confirmed on screen, the subject cannot be approached safely, or the image will be used for measurement or formal evidence. That keeps workers from guessing which device management expects them to use.
Track the entire task from taking the photo to attaching it to the correct record. If the phone produces accepted documentation with fewer handling steps, that is a strong reason to approve it for routine work. If reviewers keep rejecting particular types of shots, you have a defined boundary instead of a general argument about whether the camera is good.