SMS compliance in Czechia

No statutory quiet hours identified; send promotional SMS 08:00-20:00 local time (industry best practice). Transactional/OTP 24/7.

Source: Industry practice – no official text found

Prior opt-in consent required for promotional SMS under GDPR + Act 110/2019; Act 480/2004 (unsolicited commercial communications); transactional/OTP allowed within an existing service relationship.

Source: GDPR + Act 110/2019; Act 480/2004 (unsolicited commercial communications)

Promotional SMS must offer a free, simple opt-out (e.g., reply STOP); honour requests promptly and suppress opted-out numbers.

Source: Operator/aggregator policy (best practice)

Blocked: phishing/fraud, illegal or unlicensed gambling, adult content, hate/political content (most operators), counterfeit/illegal goods, unlicensed financial offers; URL shorteners often blocked.

Source: Operator content policies / national advertising law

GDPR + Act 110/2019; Act 480/2004 (unsolicited commercial communications). Supervisory authority: UOOU.

Source: GDPR + Act 110/2019; Act 480/2004 (unsolicited commercial communications)

Registration on T-Mobile and O2 to keep alpha SID; monthly fee.

Source: Operator/regulator registration rules

Classify traffic as promotional or transactional; OTP/transactional must not contain marketing content; use local language or Unicode where required.

Source: Industry practice