How can we help?
Contact Retesim if you have a question before purchasing or need assistance with an existing order or eSIM.
Send us a message
Complete the form below and include as much relevant information as possible.
Company details
Retesim is operated by the following registered business in Serbia.
Igor Stjelja PR Trgovina preko interneta ADRIO DIGITAL Beograd
Legal form: sole proprietor (preduzetnik)
Tax ID (PIB): 115929903
Company ID (MB): 68756006
Activity code: 47.91 – Retail sale via mail order or via the Internet
Address: Nova 110 17, 11060 Belgrade (Palilula), Serbia
Phone: +381 60 319 9993
Email: support@retesim.com
Before contacting us
These resources may answer your question right away.
Frequently asked questions
Find concise answers about eSIMs, installation and common purchase questions.
View FAQ →Installation Guide
Follow the general steps for installing your eSIM on a compatible device.
View guide →Compatible Devices
Check eSIM support and carrier-unlocked requirements before purchasing.
Check your device →Contacting us about an existing order?
Please include your order number and the email address used during checkout. This helps us identify the correct order.
Support expectations
We will review the information you send and respond using the email address provided. No specific response time or support hours are promised on this page.
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