Little-known EE and O2 rival just removed one of the biggest reasons NOT to switch to its cheap SIM-only plan

You can switch networks and start a new contract much faster, since everything happens digitally.

For those who don't know, SMARTY is a UK-based mobile virtual network operator (MVNO), which means that it doesn't own any masts but piggybacks on infrastructure owned and operated by another brand.

In this case, the Three UK network — so if you enjoy a good connection with Three UK, you'll benefit from the exact same signal strength with SMARTY. Launched in 2017, SMARTY offers flexible, low-cost mobile plans with a focus on simplicity and transparency.

For those who don't know, eSIM stands for "embedded SIM" and refers to a small chip built directly into your phone, tablet, or other gadget. Instead of inserting a physical SIM card, your mobile plan can be downloaded straight onto the eSIM via a mobile app, scanning a QR code, or other simple methods.

Most Android phones can store five to seven eSIMs, with users able to run two phone numbers — a work and home number, for example — at the same time. Likewise, the latest iPhone models can store eight eSIMs and run two at the same time.

You can also use eSIM, which can be loaded onto your handset with a QR code scan, to unlock cheaper 5G data to use when abroad, while keeping your UK mobile number for incoming calls.

For now, you'll need to be an existing SMARTY customer to swap your physical SIM for an eSIM.

Just head to your account section of the website and request the switch now.

But if you're looking to join SMARTY as a new customer, you'll have to wait a bit.

They're not offering eSIM directly to new sign-ups just yet. The workaround? You could still join with a physical SIM and then swap it for an eSIM once you're set up.

Group plan owners are in the same boat; they'll need to wait for direct eSIM ordering to become available. According to SMARTY, this is part of its "soft launch" approach with eSIM rollout across the UK.

Want to check if your phone works with eSIM? Just dial *#06# on your keypad.

If you see an EID number pop up, you're good to go. Once you've confirmed compatibility, you can request the switch through SMARTY. They'll send you an email with everything you need — a QR code to scan, an activation code, and step-by-step instructions.

SMARTY is one of a handful of mobile networks that haven't reintroduced EU roaming charges in the wake of the UK's departure from the European Union, which regulated against these fees.

That means you'll be able to use your unlimited calls, text messages, and 12GB of your total data allowance each month in 27 European countries. SMARTY currently boasts one million customers in the UK.