Short answer: Control Z is the renewed smartphone brand operated by Undo World Pvt. Ltd., based in Gurugram. We sell Premium Renewed iPhones and Android devices that ship in like-new condition at 100% battery health, after over 300 quality checks, with an 18-month warranty on iPhones and 12 months on Android, and a GST invoice in your name.
But you should not take our word for any of that. This page explains the process and, more usefully, tells you how to verify it independently.
What “Premium Renewed” means at Control Z
The word matters because the category is unregulated. India has no legal definition of “refurbished,” “renewed” or “certified,” so any seller can use any of them — which is why we describe the process rather than lean on the label. Background: refurbished vs renewed vs remanufactured vs second-hand.
Sourcing and verification. Devices are checked before entering the process, including IMEI verification. A device with a blacklisted, duplicate or mismatched IMEI does not enter the pipeline.
Component-level assessment. Devices are opened and evaluated by component rather than judged from the outside. Battery, display, ports, speakers, cameras and internal connectors are assessed individually.
Replacement, not just testing. Degraded components are replaced. The battery is replaced as standard, which is why every device ships at 100% battery health rather than whatever the previous owner left behind. This is the single biggest difference between renewal and resale.
Over 300 quality checks. Covering display uniformity and touch response, Face ID or fingerprint, all camera systems, cellular and Wi-Fi radios, charging behaviour, audio and sensors. A device that fails does not ship.
Warranty and paperwork. 18 months on iPhones, 12 months on Android — longer than the 12 months a brand new phone carries — honoured directly by us, with a GST invoice issued in your name.
How to verify us yourself
This is the part we would rather you actually did. Every claim above is checkable, and a company confident in its process should be happy to be checked.
| Claim | How to verify |
|---|---|
| 100% battery health | Settings → Battery → Battery Health & Charging, on arrival |
| Clean IMEI | SMS KYM <IMEI> to 14422, or check sancharsaathi.gov.in |
| GST invoice | Check it carries our GSTIN, your name and the device IMEI |
| Warranty terms | Read them before purchase, not after |
| Device condition | Inspect on delivery against the 9-step checklist |
If the battery does not read 100%, or the IMEI does not come back clean, that is a fault and we want to know about it. A verification process only means something if it holds when someone checks.
What we do not claim
Being straight about the limits is more useful than a page of superlatives.
These are not new phones. They are remanufactured devices in like-new condition. The hardware has a history, even though the battery does not.
Software support is tied to the model. A renewed iPhone 11 receives the same iOS updates as a new one — but the iPhone 11 has fewer years left than an iPhone 14, regardless of who sells it. We would rather you bought the right generation than the cheapest one: see how many years of iOS updates each iPhone gets.
Warranty is not insurance. It covers hardware failure, not drops, liquid damage or unauthorised repairs. That is standard across the industry and worth knowing before you need it.
Saver Series units vary. They are priced individually against their own condition and configuration, which is what makes them good value — and it also means availability and specification vary unit by unit rather than being uniform.
Why the category earned its bad reputation
Because for years, “refurbished” in India often meant a used phone that was cleaned and resold. The buyer got a few good months before the original battery collapsed, and there was nobody to call.
That experience was real and widespread, and scepticism about this category is entirely rational. The honest response is not to insist we are different — it is to publish what we actually do and make it checkable. Hence this page, and the checklist above.
Where to find us
Control Z is operated by Undo World Pvt. Ltd., based in Gurugram, Haryana, selling online at controlz.world. You can browse Premium Renewed iPhones, renewed Samsung devices, iPads and AirPods.
Frequently asked questions
Is Control Z legit?
Control Z is the renewed device brand operated by Undo World Pvt. Ltd., based in Gurugram. Devices ship with a GST invoice, a clean verifiable IMEI, 100% battery health and an 18-month warranty on iPhones. Each of those is independently checkable on delivery.
What warranty does Control Z give?
18 months on renewed iPhones and 12 months on renewed Android devices, honoured directly by Control Z. That is longer than the 12-month warranty on a brand new phone.
Do Control Z phones come with 100% battery health?
Yes. The battery is replaced during renewal rather than carried over, so every device ships at 100% battery health. You can confirm it in Settings on arrival.
Does Control Z provide a GST invoice?
Yes, issued in your name on every order. It should carry our GSTIN, your name and the device IMEI.
Are Control Z phones new or used?
Neither. They are Premium Renewed — previously owned devices remanufactured at component level, with degraded parts replaced, shipped in like-new condition.
How do I check the phone I received is genuine?
Verify battery health in Settings, check the IMEI by SMS to 14422 or on sancharsaathi.gov.in, confirm the GST invoice details, and run through the 9-step verification checklist on delivery.
