About
ThirdSIM sells travel data and phone numbers that travel with you. One app: buy data before you fly, install it in a tap, and add a US, UK or Canada number that works wherever you are.
We are ThirdSIM, a company registered in Bangladesh. Our postal address is our registered address, available on request from support.
Why we built it
Landing in a new country used to mean one of three bad options: a roaming bill you find out about later, a queue at an airport kiosk for a SIM you cannot read the terms of, or no data until you find Wi-Fi.
eSIM made a fourth option possible — buy before you go, install in a tap, land connected — and then most eSIM apps made it confusing again: prices that hide the per-gigabyte cost, validity that starts when you pay rather than when you land, and support that answers next week.
So we built the version we wanted:
- The per-GB price on every plan, next to the headline price, so you can compare without arithmetic.
- Validity starts on first connection, not at checkout. Buy weeks ahead; nothing is running down.
- A wallet you top up once with bKash, Nagad, card or crypto, then spend without re-entering payment details in an airport.
- Your home SIM stays on. Our eSIM carries data only, so your bank codes still arrive.
- A full refund if you never used it, for 180 days.
Phone numbers
The second half of the product came from our own customers: freelancers billing US and UK clients who needed a local number on the invoice, and travellers who wanted one number their team could always reach.
So we added US, UK and Canada numbers in the same app, over data, billed from the same wallet. We are also blunt about what they cannot do: they are not for receiving verification codes from WhatsApp or a bank, and they do not reach emergency services. That is on the product page, before you pay, because we would rather lose the sale than take money for the wrong thing.
How we work
- We are a reseller, and we say so. The radio networks and the telephony carriers are third parties. We choose them on coverage, reliability and price, we route around the ones having a bad day, and we are responsible to you for what we sell.
- Prices move with wholesale. We reprice the catalogue as our partners’ rates change, so the price you see is today’s, not last quarter’s.
- Support is a person. Every ticket arrives with your eSIM, plan, usage, device and order already attached, so nobody asks you which eSIM you mean. Urgent connectivity problems are answered fast, because you are usually standing in an airport when you send one.
Where we are going
More countries, more regional bundles, better install guides for the phones people actually carry, and eventually numbers in more places. If there is something you need that we do not do yet, tell us: support@thirdsim.com.
Talk to us
- Support: support@thirdsim.com
- Press and partnerships: support@thirdsim.com
- Post: our registered address, available on request from support
