4S Review 2026 - Is 4S's eSIM reliable?
At a glance
Reviews & ratings
Bought 3GB Albania for $5, easy install but manual network selection needed at first, good coverage afterward.
From Thailand to Taiwan, activation before departure and instant connection without adjustments.
Immediate connection upon landing in Taoyuan from Bangkok, without extra steps.
Pros & cons
👍 What we like
- ✓Simple installation and immediate activation.
- ✓Affordable rates compared to airport SIM or roaming.
- ✓Good coverage and speeds in Europe/Asia according to feedback.
- ✓Hotspot allowed and easy top-up.
- ✓Intuitive interface on app and web.
👎 What we like less
- ✗Need to select network manually sometimes.
- ✗Limited compatibility on certain wearables.
- ✗Few user reviews accumulated.
- ✗Data-only, no calls/SMS included.
- ✗Variable notes on app stores.
What is 4S?
What is 4S eSIM?
4S eSIM is a data-only eSIM solution for international travelers, enabling immediate internet connection in over 189 countries without a physical SIM. Plans include local, regional, or global options with flexible data and varied durations, activated via QR code sent by email or app.
The web and mobile platform simplifies purchase, installation, and management, with top-up possible and hotspot sharing allowed. Compatible with most eSIM smartphones, it uses local partner networks for stable 4G/5G.
Plans overview
Destinations covered by 4S
Coverage broken down by region. Tap a region to see its countries.
Our verdict
4S eSIM offers instant global data connectivity for travelers with over 189 destinations, simple activation via QR code, and affordable rates with no hidden fees.
Popular alternatives
Frequently asked questions
No, 4S is not a scam: it is a reliable, well-known eSIM with a 4/5 rating in our test, coverage across 189 destinations and access to local 4G/5G networks (speed depends on local coverage). Just make sure your phone is eSIM-compatible before buying.
4S covers more than 189 destinations. Availability and network quality depend on the destination and the local partner operator: check that your travel country is covered before buying.
The main downsides we found in our test: Need to select network manually sometimes, Limited compatibility on certain wearables, Few user reviews accumulated, Data-only, no calls/SMS included and Variable notes on app stores.
It depends on your destination and budget: 4S scores 4/5 in our test, but the best value changes by country. Compare current deals in our comparator before choosing.
Opt for a Europe regional plan 3-10GB/7-30 days from $5, covering 47 countries with 4G/5G for navigation and streaming.
Yes, tethering/hotspot is allowed on most plans, check data limits and test on local network.
Yes for most eSIM smartphones/tablets (recent iPhones, Samsung Galaxy, Google Pixel), check support.4s.net.
Contact [email protected] quickly for technical issues, policy varies by non-activated plan.
Yes, keep physical SIM for calls/SMS and 4S eSIM for data only.
Via app or site, easy top-up without new installation, immediate activation.
No, data-only; use WhatsApp/Skype via data for comms.
What to do if 4S doesn't work?
Manually select the partner network in settings, enable then disable airplane mode, restart.
Check device compatibility, stable WiFi connection, free eSIM space. Contact [email protected].
Monitor usage in app, disable auto-updates, limit HD streaming.
Limited to smartphones/tablets, check support.4s.net list.