To activate Synchrony-issued Mastercard, Go to https://mastercard.syf.com or call the number on the sticker attached to your card or the toll‑free number 1‑855‑872‑4311.
Here’s how to activate a card through the mastercard.syf.com portal (or Synchrony-issued Mastercard):
🟢 1. Online Activation via portal
Click “I want to register” or log in if you already have an account.
Provide the following information:
Full card/account number
3‑digit CVV (security code)
Last 4 digits of your SSN
Date of birth
You may also be prompted for additional details like your monthly income.
Submit and your card should activate immediately or within moments.
☎️ 2. Phone Activation
You can call the number on the sticker attached to your card or the toll‑free number listed on the back.
One commonly referenced general activation line is 1‑855‑872‑4311.
Another source lists 1‑866‑419‑4096 for activation assistance.
Follow the prompts and provide the requested card/account details.
Activation is effective immediately.

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🔁 After Activation
You can begin using your Mastercard wherever Mastercard is accepted.
To fully access your online account, you’ll likely need to register on synchrony.com if you haven’t already.
Once registered, you can manage your card, view statements, make payments, and more.
✅ Tips & Troubleshooting
Ensure you’re on the legit site: make sure URLs start with
https://mastercard.syf.comand show the secure lock icon before entering any personal information.If the website throws an “error,” double‑check all fields, especially SSN and DOB.
Online activation is generally quicker and more convenient, but calling in is a reliable alternative—especially if the site doesn’t accept your info.
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