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Firsty Promo Code: -15% Off (August 2026)

Etienne Tillier Verified by Etienne Tillier · ✓ Updated August 20, 2026 · MyBestSim rating: 4.1 ★★★★★★

Our exclusive Firsty promo code MYBESTSIM15 gives -15% off every Firsty eSIM, tested and verified on August 20, 2026. Copy it, open the Firsty store, and grab the discount in seconds.

★ Best offer · Exclusive MyBestSim code
Firsty
Firsty
1 active promo code
-15%
off
MYBESTSIM15
✓ Verified August 20, 2026 · No expiration

How is the discount applied?

For example, a Firsty plan at $43.99 drops to $37.39 with the promo code. The discount applies right on the Firsty store, in seconds.

1
Copy the promo code

Hit “Copy”: the promo code MYBESTSIM15 lands straight in your clipboard.

2
Open the Firsty store

“See Firsty deals” pastes the promo code and opens the Firsty site in a new tab.

3
Paste at checkout

When you pay, paste the promo code: -15% comes off the total instantly.

9:41📶 100% 🔋
Firsty
Firsty
🔒 firsty.app
Your order
eSIM World
10 GB · 30 days$43.99
🎟Code MYBESTSIM15−$6.60
Total$37.39
Pay $37.39
🔒 Secure payment
Example: the exact price depends on the plan you pick on the Firsty store.
Valid on all Firsty eSIM plans, no minimum purchase required.The -15% discount is applied at checkout on the official Firsty store.This is an exclusive offer negotiated by MyBestSim, with no stated expiration date.
Firsty
About Firsty ★ 4.1/5

Firsty is an eSIM provider for international travelers, offering flexible data plans with instant activation.

Read our full Firsty review
August 20, 2026Verified ✓
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MYBESTSIM15: the best Firsty promo code available, tested and verified

We regularly test Firsty promo codes to confirm they work, right at checkout on the official store. Here’s the best code currently available, verified on August 20, 2026. Beware: some codes floating around coupon sites give no discount, or a smaller discount than advertised:

  • ✓MYBESTSIM15Tested and confirmed on the official store-15% verified
  • ✗FIRSTYFREESeen on coupon sites — expired or invaliddoesn’t work
  • ✗FIRSTY50Seen on coupon sites — expired or invaliddoesn’t work
  • ✗WELCOME10Seen on coupon sites — expired or invaliddoesn’t work

Last checked: August 20, 2026. If you’re offered another Firsty code elsewhere, test it in the order summary: if it shows no discount, it doesn’t work. Prefer using a valid promo code like MYBESTSIM15.

Firsty promo code — frequently asked questions

Yes.The code MYBESTSIM15 is active and gives -15% off Firsty eSIMs.We tested it at checkout on August 20, 2026.
Copy MYBESTSIM15, click “See Firsty deals” to open the Firsty store, then paste the code at checkout: the -15% applies instantly.
No, MYBESTSIM15 has no known expiration date.We re-verify it regularly and update this page.
Yes, MYBESTSIM15 is a standing code: you can reuse it on every new Firsty purchase, it’s not single-use.
Double-check it’s pasted with no extra spaces into the “promo code” field on the official Firsty store.Some already-discounted plans may exclude stacking.See the conditions below.
No, MYBESTSIM15 generally can’t be combined with another Firsty deal or promo code: only one code applies per order.
MYBESTSIM15 applies to every Firsty plan and every destination, for new and existing customers alike.
Yes, they’re exactly the same thing.Whether you’re looking for a “Firsty promo code”, a “Firsty coupon” or a “Firsty discount code”, it’s the same MYBESTSIM15 that gives -15% off your Firsty eSIMs.
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Firsty -15% off
with the code MYBESTSIM15
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