Guides & Resources
The Phone Came Back: IMEI Tracking, Warranties and Repairs for Electronics Shops
Electronics retail has a problem quantities can't solve — when a unit comes back, you need to know which unit it is. Here's how to track units, not counts.
MerxumOS Team
Jul 24, 2026

Most retail stock is a quantity. You have forty tins of milk; sell one and you have thirty-nine. It genuinely doesn't matter which tin.
Electronics doesn't work that way. When a customer walks back in with a handset, the questions are all about that specific unit: did we sell this one, when, is it still under warranty, and has it been in for repair before? A quantity can't answer any of them.
Track units, not counts
The shift is to record each unit individually by its serial or IMEI, so a handset has a history rather than being one of forty. Then a returning customer is a lookup instead of an argument — you can see the unit, the sale, the date and the warranty in front of you.
- Capture the serial or IMEI when the unit comes in and when it goes out.
- Know which exact unit went to which customer, and when.
- Look any unit up by its number at any point in its life.
Register the warranty at the point of sale
A warranty registered at the till, with its expiry, turns a dispute into a check. Either the record says the cover is live or it doesn't. This protects the customer as much as you — and it stops the slow drift where staff honour claims that expired months ago because nobody could prove otherwise.
Run repairs as jobs, not favours
Repairs are where small electronics businesses lose the most time and goodwill, usually because a job lives in someone's head between the counter and the bench.
- Log what came in, whose it is and what's wrong with it.
- Quote the repair and record what the customer agreed to, before work starts.
- Move the job through its stages so its state is never a question.
- Update the customer automatically as it progresses — that's what stops the 'is it ready?' calls.
- Hand it back and take payment through the normal till, so the repair is real revenue in your books.
Trade-ins are stock, not a drawer of old phones
Part-exchange is normal in this trade, and it's usually handled badly: the old unit is valued roughly, credited against the new sale, and then sits in a drawer. Valued properly and brought into stock, that handset is inventory you can refurbish and sell — with its own serial history, like everything else.
In electronics, the sale isn't the end of the record. It's the beginning of one.
MerxumOS tracks electronics by serial and IMEI, registers warranties at the point of sale, runs repair jobs with customer updates, and brings trade-ins into stock. See it at merxumos.com/industries/electronics.