SMS sender and credits
SMS is priced in credits with country-specific multipliers, so the same monthly bundle that covers 1,250 US sends covers only 250 UK sends.
What people actually say
✕A UK SMS consumes 5 Klaviyo credits versus 1 for the US, so the included 1,250-credit bundle on Email plus Mobile covers only 250 UK messages before overage credits kick in.
Source: Klaviyo Help Center, mobile credit system ↗✕Effective per-message rates work out at roughly $0.036 in Canada, $0.048 in Australia and $0.060 in the UK — three to five times the US rate — once Klaviyo bundles carrier fees into the credit price.
Source: Retainful, Klaviyo SMS pricing breakdown ↗✕Reviewers note that at scale a Shopify store can spend more on SMS credits than on its entire email plan, with 26k-profile stores reporting $2,000-plus monthly SMS bills.
Source: G2, Klaviyo pros and cons ↗
We wire your SMS sender directly to Twilio, MessageBird or Vonage, so you pay the underlying carrier rate plus a thin margin you can see — no opaque credit conversion and no Klaviyo platform fee stacked on top of carrier markup. Short codes, alphanumeric senders and STOP handling are configured per country, and overage is just a Twilio invoice line you can audit.