4S eSim

4seSim is a travel eSIM provider offering prepaid mobile data plans across more than 190 countries and regions. eSIMs are digital SIM profiles delivered by QR code that install on eSIM-capable smartphones (iPhone XS and later, most 2020-plus Android flagships) without swapping physical SIMs. Singapore travellers use 4seSim to stay connected in Japan, Korea, Taiwan, Europe, and the US without buying a physical SIM at destination airports. Purchase via 4sesim.com and click through from the ShopBack 4seSim merchant page to earn cashback on eligible orders at the current published rate.

4seSim runs a top-up wallet system and email-tier newsletter promos rather than a formal points-based loyalty programme. Repeat customers get early access to sale windows and country-specific promos. For Singapore travellers taking multiple overseas trips a year, the value sits in convenience (buy-before-departure, activate-on-landing) and cashback stacking through ShopBack rather than a tier ladder.

4seSim typically runs sale windows aligned to Singapore holiday and travel calendar: Chinese New Year (February 2026), March-April (Sakura Japan travel), June (Great Singapore Sale + school holidays), September 9.9, October 10.10, 11.11, Black Friday (November 27, 2026), Cyber Monday (November 30, 2026), and 12.12 year-end. Country-specific promos on Japan, Korea, Taiwan, and Europe destinations align with peak travel seasons. Verify current sale windows on 4sesim.com.

After purchase on 4sesim.com, the traveller receives a QR code by email. On an eSIM-capable phone, scan the QR under Settings > Mobile Data (iPhone) or Settings > Network > SIMs (Android) to install the eSIM profile. Activation typically triggers on first landing in the destination country when the phone connects to a local network partner. Keep the primary Singapore SIM active for SMS OTP and iMessage; use the 4seSim eSIM only for data. Verify installation steps on 4sesim.com before departure.

Airalo leads on brand recognition in Singapore, wider country and regional plan coverage across 200-plus destinations, and a polished mobile app for eSIM management. 4seSim leads on select country-specific promo pricing (especially Japan, Korea, Taiwan) and simpler purchase flow via desktop web. For a first-time eSIM buyer wanting app-based management across multiple trips, Airalo is a stronger default. For a specific Japan or Korea trip where 4seSim has a promo, cross-check before locking. Both are cashback-eligible via ShopBack where applicable.

Holafly leads on unlimited data eSIM plans, 24/7 chat support in English, and strong Europe and Americas coverage. 4seSim leads on data-capped plans that are typically cheaper for shorter trips (3 to 10 days) and Asia-focused country plans. For a Europe multi-country trip needing unlimited data, Holafly typically wins. For a Japan or Korea one-week trip with 3 to 10 GB data budget, 4seSim can beat on price. Cross-check total cost per GB before booking. Both are cashback-eligible via ShopBack where applicable.

4seSim covers more than 190 countries and regions with individual country plans and multi-country regional plans. Top destinations for Singapore travellers include Japan (Docomo and SoftBank network partners), Korea (SK Telecom, KT), Taiwan (Chunghwa, Taiwan Mobile), Thailand (AIS, True), Vietnam (Viettel, Vinaphone), Indonesia (Telkomsel, XL), UK (EE, Vodafone), Germany (Vodafone, Telekom), USA (T-Mobile, AT&T), and Australia (Telstra, Optus). Regional plans covering EU, ASEAN, and North America bundle multi-country coverage for cross-border trips.

For Singapore travellers, 4seSim works best for short-haul Asia trips (Japan, Korea, Taiwan, Thailand, Vietnam, Indonesia) where data volume is moderate, cross-border ASEAN trips using regional plans, and long-haul Europe or US trips where roaming with a local telco is expensive. Install the eSIM QR before leaving Singapore, activate on landing at the destination airport, and keep the primary Singapore SIM active for SMS OTP receiving. Verify device eSIM compatibility on 4sesim.com before purchase.

Clear any pending 4seSim purchase cart, then click through fresh from the ShopBack 4seSim merchant page to 4sesim.com. Complete the purchase in the same browser session using card payment, and confirm the QR code delivery email. Avoid pasting unofficial third-party promo codes at checkout since they can break cashback tracking. Cashback tracks on the paid plan price for eligible orders. See the current published rate on the ShopBack 4seSim merchant page.

Yes. Any cancelled or refunded portion of your 4seSim purchase is voided from the ShopBack cashback total. Because eSIMs are digital goods, cancellation windows are typically short (before QR code is issued or before first activation). Verify the specific cancellation policy at purchase. Refunded or activated-but-unused plans typically will not confirm pending cashback.