Lempart Flex eSIM review

Read this before you buy from Lempart Flex

Lempart Flex is a brand new US seller built around unlimited plans that say exactly what you get: a daily amount at full speed, then a stated slower speed. The company is registered and it fixed three faults we raised. Its store matched its data on the plans we compared on 3 October 2026 and on a sample of 141 plans on 12 October. It was only filed in September 2026 and we found no reviews of it on 3 October 2026. Most of the prices we could compare went up between 8 and 12 October.

• The company checks out. When we checked on 3 October 2026 the Wyoming Secretary of State register listed Lempart LLC, filing ID 2026-002079904, as an active company in good standing, filed on 11 September 2026. Their site names the same company. The street address on the register is a registered agent address, so it does not show where they work from.
• It is very new. The domain was registered on 6 September 2026 and the iPhone app arrived later that month. On 3 October 2026 Trustpilot had a profile for them with no reviews, and we found no other independent record of their service that day.
• Their unlimited plans are clear about the slow part. Every plan states the daily full speed amount and the speed after it, which ran from 128 kbps to 10 Mbps on 12 October 2026. Most sellers leave the second number out. The two are different products, so each speed has its own row in our tables.
• Their store agreed with their data on the plans we compared. On 3 October 2026 all 12,699 plans found in both matched on price, daily amount, after speed and length. On 12 October we took 141 plans from across their catalogue and each one matched their own store record on price, length, countries, networks, speed, hotspot and top up. These were one off checks, not the repeated shop check we run on some sellers. We have not built that for them yet, which is why the panel above says their prices are not shop checked.
• Most of the prices we could compare went up between 8 and 12 October 2026. They told us on 9 October that a large part of the catalogue had been repriced overnight on 8 to 9 October and some plans replaced. We compared the cheapest price for the same destination, amount, length and, on unlimited plans, the same speed after the daily amount, on 8 October and on 12 October. Of the 6,430 we could match, 4,789 cost more, 442 cost less and 1,199 were unchanged, and the typical change was about 12.5% up. Our nightly import failed on 9, 10, 11 and 12 October because it stopped on their new destinations, so our pages kept showing their 8 October prices until we fixed it on 12 October.
• On fixed bundles they sit close to the market median per gigabyte. On 12 October 2026, taking each seller at its lowest price per gigabyte on plans up to 50 GB, they were in the cheaper half of sellers in 150 of 203 countries and in the top three in 3. They tied for cheapest in one and were the single cheapest seller in none.
• They fixed three faults we raised. On 3 October 2026 we told them their data marked 5G on plans that top out at 3G/4G, that their refund policy said two different things, and that their country list read as if they did not sell to the UK or the EU. When we read them again on 12 October their data carried each plan's own top speed and a hotspot field, the refund policy gave one rule for a plan that was never installed, and the country list said buyers there can still purchase on the website. We also told them that 32 plans in their data were in no store listing and that 3 store plans were missing from their data. They told us on 8 October 2026 that they would fix both, and we have not checked that again.
• Their reader code ESIMWATCHDOG takes 10% off a first order. On 3 October 2026 it was added at their checkout by itself after we arrived through our link, and it also applied when typed by hand, on a US unlimited plan, a Japan fixed bundle and a Europe regional plan. We did not complete a purchase.

We list Lempart Flex because its prices are real and its plans rank on the same maths as everyone else's. We publish what we could not verify so you can decide with the facts in front of you.