Frequently asked questions
What is an eSIM and how does it work?+
An eSIM (embedded SIM) is a digital SIM built into your phone. Instead of inserting a physical card, you download a plan directly onto your device. Once installed, your phone connects to a local network at your destination — no SIM swap needed.
Is my phone eSIM compatible?+
Most modern smartphones support eSIM, including iPhone XS and newer, Samsung Galaxy S20 and newer, and Google Pixel 3 and newer. On iPhone, go to Settings → General → About and look for an EID number. Your phone must also be unlocked to use most travel eSIM plans.
How do I install an eSIM?+
After purchasing, you usually receive a QR code or in-app install instructions. Install the eSIM on Wi-Fi before you travel, then activate the data line when you arrive unless the provider says the plan starts immediately after installation.
How much eSIM data do I need for travel?+
Light users usually need about 1–2GB per week for maps, messaging, and occasional browsing. Moderate users often need 3–5GB per week. Heavy users who stream video, hotspot, upload photos, or work remotely should consider 10GB+ or unlimited options.
Can I use hotspot or tethering with a travel eSIM?+
Many travel eSIM plans allow hotspot, but not all of them do. Some unlimited plans may restrict tethering or reduce speeds after a fair-use threshold. Always check the provider details before purchasing.
When should I buy and activate my eSIM?+
For most trips, buy and install your eSIM before departure while you have reliable Wi-Fi. Keep your home line active if needed, but turn off roaming for your primary SIM to avoid unwanted charges. Activate the travel data line when you land.
Can I keep my normal phone number while using an eSIM?+
Yes. Most dual-SIM phones let you keep your normal number active for calls or texts while using your travel eSIM for mobile data. In your phone settings, set the eSIM as the data line and review roaming settings before travel.
Are unlimited eSIM plans truly unlimited?+
Unlimited plans can be useful, but some include fair-use limits, hotspot restrictions, or speed reductions after heavy use. TernRoam helps you compare providers, but final plan rules are always confirmed on the provider website.
Do eSIM plans include calls and text messages?+
Most travel eSIMs are data-only. Some plans include calls and SMS, but they are less common. If you need calling, look for plans marked Calls+SMS or use apps like WhatsApp, FaceTime, iMessage, or Google Voice over data.
Can I install more than one eSIM?+
Many newer phones can store multiple eSIMs, though only one or two lines may be active at the same time depending on the device. This is helpful for multi-country trips or comparing providers.
What happens if I run out of data?+
Some providers allow top-ups, while others require buying a new plan. Before purchasing, check whether the provider supports top-ups for your destination and whether unused data expires.
How do price drop alerts work?+
Click “Alert me if this drops” on a plan card and enter your email. We will notify you when a better match or price drop is available for that provider and destination.
How does TernRoam make money?+
TernRoam may earn an affiliate commission when you purchase through links on this site — at no additional cost to you. Pricing and final plan details are confirmed on the provider’s website.