How to Top-Up Your eSIM

Running low on data mid-trip doesn't mean starting over. Add more to your existing KnowRoaming eSIM in a few steps, right from your account, with no new SIM and no new QR code.

This guide covers the basics and the parts that usually come up after: what to check if a top-up hasn't applied, when unlimited data makes more sense than topping up as you go, how auto top-up works if you'd rather not think about it at all, and how Kreds let you earn cashback on every top-up you buy.

Step-by-step: top up your KnowRoaming eSIM

1. Log in at KnowRoaming.com and go to My eSIMs & Top Up.
2. Select the eSIM you want to top up.
3. Choose an add-on package. Packages come in a range of data sizes.
4. Complete your purchase. Your eSIM updates with the extra data, and a percentage lands back in your Kreds wallet automatically.

If your top-up hasn't applied yet

A top-up usually reflects within a few minutes. If your data still shows as unavailable after that:

• Toggle Airplane Mode on, wait about 15 seconds, then turn it off. This forces your phone to reconnect and pick up the new package.
• Confirm your eSIM is still set as the active data line. A restart or software update can occasionally reset this.
• Restart your phone. It clears temporary network errors and is worth doing before anything more involved.
• Check the network. If the local carrier is having an outage, no amount of toggling will fix it. Try again in a few minutes or check whether a different supported network is available in your area.
• Confirm your purchase went through. Check your email for a confirmation, and check your account under My eSIMs & Top Up to see the new package listed.

If none of that resolves it, contact support. Have your order confirmation ready. It speeds things up.

Why data runs out faster than expected

A top-up need often comes down to simple math. In a real-world test using a KnowRoaming eSIM, six travel apps run for 10 minutes each, Spotify, Instagram, TikTok, Google Maps, WhatsApp video, and Microsoft Teams, used a combined 906 MB in just over an hour, background activity included. Spotify alone accounted for close to 300 MB of that in 10 minutes of streaming.

None of that is unusual travel behavior. It's just more than most people budget for. Monitoring your eSIM data usage walks through exactly what each app costs and how to keep an eye on your balance in real time, so a top-up is something you plan for rather than something that catches you out.

What travelers say about topping up with KnowRoaming

Real feedback from verified reviews.io customers:

"So quick and easy to load. Started working straight away and kept working as I moved from one Europe country to another. An email was sent to let me know when I had 39% left, and then when I ran out. Easy to top up, and it worked immediately." — Lynne

"Excellent product. Very easy to use and works without any problems. Top-ups are quick and easy. Highly recommend." — Pete

"I'd highly recommend this eSIM service for Europe. It was a frictionless signup and setup process, and the pricing was also really good compared to competitors. Using a Galaxy S25 and an iPhone 14, once installed and activated, we had flawless service in every country we visited. It's also easy to monitor and top up data." — Rudi

"Had an excellent experience, connected at any minute. Had to top up and used KnowRoaming support. The support was amazing, fast and efficient." — Eva

"Easy to use and top up. I always use KnowRoaming when I travel." — Gcobisa

"This was really wonderful to have, and so easy to use and top up during the holiday away." — Sandra

Why unlimited may beat topping up manually

A fixed plan works well if you know roughly what you'll use. But data use on a trip is rarely predictable. A day of turn-by-turn navigation, a video call back to the office, or an evening uploading photos can burn through a fixed package faster than expected, and that's usually when a top-up gets bought under pressure, mid-trip, without much thought to which package actually makes sense.

An unlimited plan removes that calculation. You get a set amount of high-speed data every 24 hours, and speeds step down for the rest of that day rather than cutting off. For travelers who navigate constantly, work while they travel, or simply don't want to check a data counter, that's one less thing to manage. It also tends to work out more predictable on cost than several ad hoc top-ups added together over a longer trip.

If you're not sure which way to go, a short trip with light, predictable use suits a fixed plan. A longer trip, a work trip, or anything where you'll lean on maps and calls all day points to unlimited.

What auto top-up is, and why it's worth understanding

Auto top-up adds data to your eSIM automatically when your balance gets low, using the payment method on file, so you're not left checking a data counter mid-trip.

It's built for the moments a manual top-up is hardest to do: crossing a border, standing in a queue, or halfway through directions to a hotel with no wifi in sight. Instead of noticing you're out of data at the worst possible moment, the top-up happens before that point.

Worth knowing: auto top-up is switched on by default when you buy a KnowRoaming eSIM. That's deliberate, it's designed to keep your trip uninterrupted, but it also means a charge can land on your card without a prompt each time. You can turn it off any time from your account if you'd rather approve every top-up yourself.

What we're hearing from travelers

Public reviews of KnowRoaming give a useful read on where auto top-up lands well and where it doesn't. The recurring theme: travelers who knew the feature was on found it genuinely useful for staying connected without interruption. Travelers who didn't realize it was on by default were caught off guard by a charge on their card, particularly a recurring weekly one on longer trips.

That's a checkout clarity problem more than a feature problem, and it's a fair prompt to make sure auto top-up is called out clearly at the point of purchase, not just buried in account settings afterward.

Earn Kreds every time you top up

Every top-up also earns you Kreds, KnowRoaming's built-in cashback. You get between 3% and 15% back in Kreds on any eSIM purchase or top-up, added straight to your KnowRoaming Wallet the moment the transaction completes. There's no separate loyalty card or app to set up. It's automatic on every account.

Kreds carry a fixed dollar value, so $1 in Kreds is $1 off your next plan or top-up. They don't expire, and you can stack them across multiple trips, so a top-up bought mid-holiday quietly builds credit toward your next one.

Referring a friend adds to the balance too: you get $4 in Kreds when they make their first purchase, and they get $4 on signup. Your referral link is in the KnowRoaming app under Refer a Friend, or in your account dashboard at KnowRoaming.com/kreds.

Moments you don't want to be caught without data

A few scenarios where running out of data costs more than an inconvenience:

• Landing in a new country and needing a ride-hailing app or a map to get to your hotel, with no wifi at the airport.
• A work call or a client email that can't wait until you find a connection.
• Showing a digital boarding pass or hotel booking confirmation at a check-in desk.
• Translating a menu, a sign, or a conversation at a pharmacy in a country where you don't speak the language.
• Confirming a two-factor authentication code for your bank or email while traveling.
• Crossing a border where you need proof of onward travel or accommodation pulled up on your phone.

None of these are edge cases. They're the ordinary moments a trip runs through, which is why keeping data topped up, whether manually, on an unlimited plan, or through auto top-up, matters more than it seems until it doesn't.

Stay connected wherever you travel

A KnowRoaming eSIM covers you across countries, and keeping it topped up, whichever way you choose to do that, takes a few taps and earns you Kreds back while you're at it.

Frequently asked questions

How long does a top-up take to apply? Most top-ups apply within a few minutes. If it's been longer and a phone restart hasn't helped, get in touch with support so we can check the package on our end.

Can I top up before my current data runs out? Yes. There's no need to wait until you hit zero. Topping up early is a sensible move before a long day out with patchy wifi, or before you head somewhere with less reliable coverage.

Does topping up reset my validity period, or add to it? This depends on the package. Check the specific package details before you buy if the validity window matters for your trip. [Flagging for Caitlin: worth confirming the exact policy here with product/support before this goes live, since it's the kind of detail that generates support tickets if it's wrong.]

What happens if my data runs out and I don't top up? Your eSIM stays installed, but data stops until you either top up or your next plan starts. Calls and texts on your home SIM aren't affected, since your eSIM only ever handled data.

Can I switch to a different plan instead of topping up? Yes. If you're consistently running through fixed data early, it's often more efficient to switch to an unlimited plan for the rest of your trip rather than topping up repeatedly. More on that below.

Can I use tethering with my eSIM? Yes. Setup instructions are available for iOS, Android, and Pixel devices.

Can I make calls with my eSIM? No. Your eSIM covers data only.

Can I buy an eSIM that covers multiple countries? Yes. KnowRoaming offers eSIMs for multiple countries and full regions, depending on where you're headed.

Do I earn anything for topping up? Yes. Every top-up earns Kreds, cashback of 3% to 15% depending on the plan, added to your wallet automatically and usable on any future plan or top-up.