Short answer: use the APN shown on your 4S service page or order email. Do not guess it.
Where to find it
- Open 4s.net/service or 4s.net/login.
- Open your purchased eSIM.
- Look for APN or network settings.
For APN settings, the important field is APN. The Name field is only a local display name and can be anything recognizable, such as 4S, Travel, or your destination.
Leave username, password, proxy, and port blank unless your 4S page shows a value for that specific eSIM.
Need help?
Contact 4S support through support@4s.net, a Zendesk support ticket, or Zendesk live chat. Do not reply to hi@4s.net; it is an automatic order and installation email sender.
When contacting support, include your order email, ICCID if available, destination, phone model, and screenshots of the error or SIM/eSIM settings page.