Thursday, November 5, 2026 · Customer reviews of US businesses
The Fair Hearing score
Bad
30 reviews
SinchSelect a line to read only those reviews.
Honesty, pricing, process and quality scores appear once 5 customers have rated them.
Sinch provides the global communications infrastructure businesses rely on to engage customers across messaging, voice, email, verification, and more. For nearly two decades, Sinch has powered the world's most critical customer communications, bringing together SMS, RCS, MMS, WhatsApp, voice, and email into one platform used by more than 200,000 businesses, including 8 of the 10 largest U.S. tech companies.Through an open ecosystem of APIs, applications, integrations, and AI platforms, customers can connect and scale communications in the way that works best for them, using Sinch's own Agent Tools (MCP, Functions, Skills), integrating existing technology, or bringing their own AI and partner platforms.Sinch's infrastructure is built for global scale and reliability: 600+ direct carrier and operator connections, 160 million-plus active phone numbers, and 99.99% uptime, backed by ISO 27001, ISO 9001, PCI DSS, and SOC I and II certification, GDPR and HIPAA compliance, and MEF Code of Conduct approval.We meet businesses where they are, whether they want to build with Sinch APIs, co-create using our tools and integrations, or buy ready-made outcomes, supported by flexible onboarding, dedicated customer success, and support models that help them accelerate time to value.Recognized as a Leader in the 2026 Gartner Magic Quadrant for CPaaS and the IDC MarketScape for Communications Engagement Platforms, Sinch is trusted by brands like Adobe, Uber, HSBC, and American Express, at more than 1 trillion customer interactions a year.
Sinch (sinch.com) has 30 customer reviews on The Fair Hearing, with an average rating of 1.3 out of 5.
30 approved reviews, newest moderated first
Sinch allows telemarketers and scammers to use their service to flood people with robocalls. Sinch does nothing to stop it when you report the numbers because the scammers will use or spoof another number
By ML
I have a software startup and like others mentioned, they won't let me fund my account. I didn't pass their security checks and they won't give any more information. Good thing there are many more providers and it's better that I found out now.
By T F.
As a founder of a legitimate business in the telecom space, I was hopeful to use Sinch for voice services tied to our global eSIM platform. Unfortunately, the experience was frustrating from the start. My payment was rejected without clear reason, and after multiple attempts to provide business details, I was met with vague responses and no path forward. I understand the need for fraud prevention, but Sinch’s process lacks transparency and leaves no room for legitimate early-stage startups to work with them. A disappointing experience that doesn’t inspire confidence in scaling with their platform.
By Omar Q.
Would leave 0 stars if I could. This company provides services to scammers as well as stalkers and harassers. Their customer service is a joke and they are extremely rude to anyone seeking needed information for law enforcement. I don’t understand how companies like this are allowed to operate and I’m sure there’s a special place in hell for anyone who works or does business with them.
By Kaitlyn
This is a telecom provider that primarily supports scam and spam operators. Have received multiple scam calls from their networks (and in once instance the scammer confirmed they were a scammer). Sinch's revenue comes from evil acts.
By RM
Sinch and Onvoy do absolutely nothing but facilitate spam and robocalls from East Indian con artists.
By Kevin K.
Vi använder deras conversation API för att skicka sms. Varje steg i att få till det var krångligt. Det krävs att man mejlar deras support för i princip allt, av någon anledning så har de inte fixat eller stängt av grundläggande funktioner från sin developer dashboard. Till exempel skulle jag nyligen skapa ett nytt projekt, det går inte att göra själv. Det tog 8 dagar för dem att fixa det och då skickade jag även påminnelse efter 4 dagar.
By Jim T.
Probably the worst costumer service in the whole world. I have never ever experienced such a bad costumor service in my whole life. Just avoid them, if you run in to problems, OR if they charge you extra never even mind to try to get your money back.
By Thami Z.
