The esimchart editorial team

Mustafa Yigit

Founder & Editor-in-Chief

Mustafa is the founder and editor-in-chief of esimchart. Based in Bergisch Gladbach, Germany, he has been building independent comparison portals since 2019 — including test-vergleiche.com with 170,000+ product comparisons. His focus on esimchart: methodology, provider partnerships and editorial standards.

Turan Yigit

Co-Founder · Operations

Turan runs operations and partner management at esimchart. With years of experience in affiliate marketing, he negotiates partner terms and makes sure plan data flows cleanly from provider datafeeds into our database. His focus: technical integrations, provider onboarding, data quality.

Mehmet Yigit

Tech Reviewer

Mehmet is our tech reviewer. He tests eSIM plans on real iPhones, Pixels and Galaxies — checking 5G reception, carrier roaming behavior and setup complexity. If a plan promises 5G but delivers only LTE in real-world conditions, Mehmet catches it. His tests feed directly into our ratings.

Roland Müller

Senior Travel Editor

Roland is our senior travel editor for business travel and Europe. With 200+ business trips per year across European cities, he knows what frequent travelers need: stable 5G, reliable hotspot, no roaming caps. Roland tests eSIMs against daily business use cases.

Heike Kruse

Travel Editor · Asia

Heike is our Asia specialist. She has spent years travelling Tokyo, Bangkok, Seoul and Bali, testing eSIM compatibility, 5G availability and carrier-specific quirks. If you have a question about Japan or Thailand eSIMs, Heike is your first contact.

Christine Krautmann

Travel Editor · Europe

Christine knows Europe inside out. Italian coast, Parisian cafés, Greek islands — she tests eSIMs in every Mediterranean country and benchmarks Vodafone, TIM, Orange and Cosmote in real travel scenarios. Her strength: pairing practical travel advice with eSIM choice.

Corinna Bischoff

Travel Editor · Turkey & Family

Corinna is our Turkey and family-travel specialist. With three children, she knows what families need: reliable Wi-Fi for kids' apps, hotspot for the tablet, dead-simple activation. She tests eSIMs under family travel conditions — pool, restaurant, sightseeing — so real-world issues surface fast.

Mareike Puschbaum

Travel Editor · Americas

Mareike is our Americas editor. From New York to Mexico City, Vancouver to Cancún, she covers North-American carrier behavior and Latin-American roaming quirks. She verifies T-Mobile coverage in the US, AT&T in Mexico, and whether 5G plans actually deliver 5G.

Sabrina Martens

Digital Nomad Editor

Sabrina has lived as a digital nomad for years — switching countries monthly, working remotely, depending on rock-solid connectivity from Bali to Lisbon to Mexico City. Her expertise: global eSIM strategies, multi-country plans, top-up routines, and balancing local with worldwide eSIMs.

Anita Preuss

Content & SEO Editor

Anita owns content strategy and SEO at esimchart. She makes sure every article — from country comparisons to setup guides — is well-researched, clearly structured and search-friendly. Her standard: no keyword stuffing, no marketing copy. Honest content that travelers actually use.