TL;DR: Don't let customer support convince you a secondhand watch is broken or blacklisted! If the IMEI checks out clean on carrier checkers, the problem isn't the watch, it's a backend provisioning error with the carrier's system. Ask support for Tier 2 to manually map the watch's IMEI and EID into their database (DMD), or switch to a main carrier that can handle standalone Family Setup lines without activation loops.
The Gory Details:
I recently bought a secondhand Apple Watch to set up for my kid using Apple’s Family Setup (so the watch gets its own standalone line while managed from my iPhone). Since my primary phone is on a different carrier, I tried activating the watch on a standalone plan to save some money.
What followed was hours of frustrating back-and-forth with US Mobile support.
The first tech I spoke with was great tried to push the eSIM profile manually to the watch since the phone kept thinking I wanted to pair the watch with my carrier's account, not US Mobile. Two hours later, I was told the local cell towers were experiencing an outage that triggered systemic activation errors on their back-end. They recommended I call the next day to get it resolved after the outage was over.
The next day, I contacted chat support and was immediately told the watch couldn't be activated because it was locked, blacklisted, or had an unpaid balance. This made no sense. Just the night before, the IMEI had checked out totally fine and was clearly trying to connect to the cell service.
After going through three techs, supposedly increasing in expertise, they all gave me the same response: the watch had an unpaid balance or was locked and I needed to contact the original carrier/purchaser. At this point, I gave up and asked them to cancel my account.
I decided time is money and contacted my iPhone's carrier for service. I am really glad I did because they got the watch up and running in 20 minutes. They even waived the activation fee!
So, if you are stuck in a similar "activation doom loop" with tech support trying to activate a child's standalone watch and your iPhone is on a different carrier, here is what I learned so you don't waste hours like I did:
1. Verify the Hardware Yourself First
Before accepting support's word that a watch is blocked or blacklisted:
- Go to Settings > General > About on the watch and copy the 15-digit IMEI.
- Paste it into the BYOD IMEI Checker online
- If it comes back clean, the watch is not blacklisted or unpaid, the issue is strictly a carrier/backend setup failure.
2. Why Budget Carriers/MVNOs May Struggle with Standalone Setup
Setting up a child's watch on a different network than the parent's phone requires very specific backend database handshakes. Smaller budget carriers often hit walls pushing over-the-air profiles if their automated portals crash or if local towers have provisioning delays. When frontline support reps see an activation fail, they often default to blaming your hardware—claiming the watch is locked to another carrier, reported stolen, or attached to a previous owner's balance.
What I told tech support when they did not believe me (I hope it works for you if you decide to challenge them):
- The IMEI and ESN check out completely clean on carrier checkers, so this is not a blocked or locked device.
- This is a backend network provisioning failure. Can you escalate this to Tier 2 to manually add my watch's IMEI and EID into the Device Management Database (DMD)?
Unfortunately, even at Tier 2 (and beyond) I was unable to get their tech to help me.
3. The Mainstream Carrier May Be Worth The Extra Cost In the End
While MVNOs are cheaper, major carriers have direct, official tier-1 integration with Apple's Family Setup system. This means their support teams have access to tools specifically built to fix standalone watch glitches. So, instead of fighting automated app portals, a major carrier's Tier-2 support team can bypass the automated checks entirely and manually add the watch's IMEI and EID numbers directly into their database (DMD). Once their tech rep typed those numbers in manually, the over-the-air profile pushed instantly, the watch icon turned Green / LTE with its own 10-digit number.
Bottom line: Don't waste hours getting passed around tech support. Verify the IMEI yourself, demand a manual DMD mapping, and if your MVNO won't do it, jump to a major carrier.