Most people unlock their phones dozens of times a day without knowing what’s actually running underneath. Calls getting redirected somewhere without your knowledge. A storage drive quietly degrading while holding years of important files. A phone model you can’t identify when you need support or want to sell it. None of these are rare edge cases — they happen constantly, and fixing them takes less than two minutes once you know where to look.
This guide covers three practical checks every smartphone or PC user should have in their toolkit: identifying your Oppo phone model, monitoring SSD health, and verifying call forwarding status.
| Topic | Primary Method | Time Required | Works On |
| Check Oppo Phone Model | Settings → About Device | Under 1 minute | All Oppo models |
| Check SSD Health | CrystalDiskInfo / Disk Utility | 2–5 minutes | Windows, Mac, Linux |
| Check Call Forwarding | Dial *#21# or Phone Settings | Under 1 minute | Android, iPhone |
How to Check Your Oppo Phone Model
People need their exact phone model more often than they expect — warranty claims, buying a compatible case, seeking software support, or simply verifying what they actually own. Oppo’s lineup has expanded considerably, with the Reno15 series, Find N6, and A-series all running simultaneously in the market. Getting the wrong model number when ordering a screen protector can waste money. Getting the right one takes seconds.
Method 1: Settings
The fastest route. Open Settings, scroll down and tap “About Device.” Right at the top, you’ll see the Device Name — the marketing name like “OPPO Reno15 Pro.” Below that sits the Model Number, which is the internal code (such as CPH2651). For warranty checks or repair services, the model number is usually what technicians ask for, not the display name.
Method 2: The Retail Box
If you still have the original packaging, flip it over or check the bottom panel. There’s a white sticker listing the model name, model number, IMEI, and serial number in one place. This is the most complete source of device identification information and doesn’t require the phone to be powered on.
Method 3: Engineer Mode Code
When the Settings app is inaccessible — maybe the display is damaged or a software issue is preventing normal navigation — there’s another way. Open the Phone dialer and type *#899#. This launches Oppo’s Engineer Mode. Tap “Software Version” and you’ll find the full model details there. This method works across most Oppo devices running ColorOS.
Bonus: IMEI-Based Verification
Dial *#06# from the Phone app to instantly display your IMEI number. This 15-digit code can be used on Oppo’s official support portal to verify your device’s warranty status, original region of sale, and authenticity — especially useful when buying a secondhand Oppo phone where the model claims don’t always match the actual unit.
How to Check SSD Health
SSDs don’t announce their failures. A hard drive makes noise, stutters, and gives you warnings. An SSD simply stops working one day — sometimes without a single prior symptom. The data stored on it disappears with it. Regular health checks are the only reliable early warning system available.
The technology behind SSD health monitoring is called S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology). Every modern SSD has it built in. The trick is knowing which tool to use to read it.
On Windows
CrystalDiskInfo remains the go-to free tool for Windows users in 2026. Download it, launch it, and within seconds you get a color-coded health assessment: blue means good, yellow means caution, red means the drive is in trouble. It displays every S.M.A.R.T. attribute in a clean table and can be set to run at startup so you get automatic alerts when anything crosses a danger threshold.
For users who prefer not to install third-party software, Windows 11 has a built-in path: go to Settings → System → Storage → Advanced Storage Settings → Disks & Volumes, select your SSD, and click Properties. You’ll see a drive health status there.
On macOS
Mac users can start with the built-in System Information tool. Open the Apple menu, choose “About This Mac,” click “More Info,” then “System Report,” and select Storage under the Hardware section. Look for the S.M.A.R.T. Status field. “Verified” means the drive is healthy. “Failing” is a serious alert that requires immediate action — back up data before anything else.
For deeper diagnostics, DriveDx is worth the $24.99 price if your Mac holds critical work. It provides real-time monitoring, tracks historical trends, and displays health in plain language rather than raw attribute numbers that require decoding.
On Linux
Smartmontools via the command line gives the most complete S.M.A.R.T. output of any available tool. The command sudo smartctl -a /dev/sda (replacing sda with your drive identifier) returns a full health report. It also lets you run short and long self-tests directly, which no GUI tool matches for depth.
What Numbers Actually Matter
Three S.M.A.R.T. attributes deserve close attention: Reallocated Sectors Count (any value above zero is a warning sign), Uncorrectable Error Count (should always be zero), and Percentage Used or Wear Leveling Count (shows how much of the drive’s write lifespan has been consumed). If the Reallocated Sectors Count starts climbing, the drive is physically degrading and replacement should be planned immediately.
A healthy SSD check takes under five minutes. Set a reminder to do it monthly.
How to Check Call Forwarding
Calls going to voicemail too quickly. Someone telling you their call was redirected. A battery-draining background process quietly forwarding your calls elsewhere. Call forwarding being active without your awareness is more common than most people realize — a setting toggled accidentally, an app that adjusted it, or a carrier-side configuration that carried over from a previous plan.
Checking it takes about thirty seconds.
The Universal USSD Code
Open your Phone dialer — on any Android or iPhone — and type *#21#, then press Call. Your carrier will return a status screen showing whether unconditional call forwarding is currently active and, if so, which number your calls are being sent to. This works without internet, functions across most global carriers, and requires no app.
For conditional forwarding (calls forwarded only when busy, unanswered, or when your phone is unreachable), the codes are slightly different: *#61# checks forwarding when unanswered, *#62# checks forwarding when unreachable, and *#67# checks forwarding when the line is busy.
On Android
Open the Phone app and tap the three-dot menu in the top-right corner. Navigate to Settings → Calls → Call Forwarding. If you’re using a dual-SIM device, select the relevant SIM first. You’ll see four forwarding types listed — Always Forward, Forward When Busy, Forward When Unanswered, and Forward When Unreachable. If any shows a number, that’s where your calls are going. Tap the option and select Disable or Turn Off to clear it.
On iPhone
Go to Settings → Phone → Call Forwarding. If the toggle is green and a number appears below it, call forwarding is active. Tap the toggle to turn it gray and the forwarding number will disappear. On some carriers, the Call Forwarding option doesn’t appear in iPhone settings at all — in those cases, the USSD code method (*#21#) is the reliable fallback.
Disabling Everything at Once
To cancel all active call forwarding in one move — across all conditions — dial ##002# and press Call. This universal reset code clears unconditional and all conditional forwarding rules simultaneously. Useful when you’ve inherited a secondhand device, switched carriers, or just want to start clean.
FAQs
Q1. How do I find my Oppo phone’s IMEI number quickly?
Dial *#06# from your Phone app. The IMEI displays immediately on screen — no need to open Settings.
Q2. How often should I check my SSD health?
Once a month is enough for most users. If your drive is over three years old or heavily used, check every two weeks.
Q3. Can call forwarding be activated on my phone without my knowledge?
Yes. Apps with phone permissions, carrier updates, or accidental setting changes can enable it. Dialing *#21# takes five seconds and confirms your current status.
Q4. My Mac shows S.M.A.R.T. Status as “Verified” — does that mean the SSD is perfect?
Verified means no critical failures are detected. It doesn’t mean the drive is new. For detailed wear data and remaining lifespan, use a tool like DriveDx or Smartmontools.
Q5. What’s the difference between “Always Forward” and conditional call forwarding?
Always Forward sends every call to another number immediately — your phone never rings. Conditional forwarding only redirects calls when you’re busy, unavailable, or unreachable, letting normal calls come through first.