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    Quick Guide
    3 min read

    Identify RCS use cases within your text messaging strategy

    Learn the differences between SMS, MMS, and RCS, and key use cases for RCS in your text message strategy.

    Compare text message protocols

    You now have different text message protocols at your disposal: SMS, MMS, Basic RCS, and Single RCS. RCS messages extend the capabilities of traditional SMS and MMS with rich media and interactivity. However, just because you can send rich content, doesn’t mean you should! There are key use cases that lend themselves better to plain text compared to visually rich content, and vice versa.

    Before diving into feature specifics, it’s important to understand regional availability for each protocol. We offer RCS in regions where SMS is supported, as SMS serves as a fallback. While SMS is widely available, some of those regions are still rolling out RCS, so availability may vary. Check out the table below to better understand availability for each protocol:

    • SMS reach: Region-specific (Learn more about region-specific details).
    • MMS reach: Region-specific (Learn more about region-specific details).
    • RCS reach: Currently in US, UK, Germany, France, Italy, Spain, Poland, Austria, Norway, Sweden, Denmark.

    Feature

    Basic RCS

    Single RCS

    SMS

    MMS

    Availability

    Limited to RCS-capable devices (Android 6.0 or later and iOS 18 or later) and supported networks

    Limited to RCS-capable devices (Android 6.0 or later and iOS 18 or later) and supported networks

    Present on all phones

    Present on all phones

    Business branding

    Yes (logo, verified badge, website, phone number)

    Yes (logo, verified badge, website, phone number)

    Limited to branded phone number types and contact cards

    Limited to branded phone number types and contact cards

    Business verification

    Yes

    Yes

    No

    No

    Character limit

    160 characters

    3,072 characters

    160 characters in the US

    160 characters

    70 characters w/ emojis

    1,600 characters (varies by carrier)

    Click receipts

    Yes

    Yes

    Partial (UTM tracking)

    Partial (UTM tracking)

    Delivery fallback

    Auto-fallback to SMS*

    Auto-fallback to SMS/MMS*

    N/A

    N/A

    Interactive elements

    Quick actions in the US

    Buttons, carousels, quick actions, etc.

    Keyword replies

    Keyword replies

    Media

    Text only

    High-resolution images, videos, GIFs (on Android only)

    Text only

    Standard images, videos, GIFs

    Network requirement

    Data connection (cellular or WiFi)

    Data connection (cellular or WiFi)

    Cellular network

    Cellular network

    Read receipts

    Yes

    Yes

    No

    No

    *While RCS has auto-fallback to SMS/MMS, it’s always best practice to customize these fallbacks so your message is clear and aligned with SMS best practices.

    Identify effective RCS use cases

    RCS is great for building brand trust, engaging subscribers with rich media, and guiding next steps with interactive buttons and replies. Take a look at a few use cases in the customer journey that are well-suited for an RCS message with rich media (also called Single RCS).

    Product launches

    How do you get people excited about your brand-new product? A high-quality visual that catches the eye immediately.

    With RCS’s rich media capabilities, you can add stunning images, videos, or carousels to showcase your product launch.

    You can also easily inspire subscribers to take action right away with buttons and quick actions.

    Best practices:

    • If launching multiple styles or products, use a carousel.
    • Include 1-3 call-to-actions.
    • Keep call-to-action language clear and concise (e.g. “Shop now”, “Save for later”).
    RCS product launch

    Checkout abandonment

    Show your subscribers what they’re missing with a visual reminder of products left behind in their shopping cart.

    Include high-resolution images, videos, or GIFs to entice subscribers back.

    Use buttons or quick actions to bring them right to their cart to complete their purchase.

    Best practices:

    • If a subscriber has left 1 item in their cart, include a high-resolution still image or video.
    • If a subscriber has left more than 1 item in their cart, use a carousel.
    • Offer 2-way support with quick replies to help address blockers to purchase.
    RCS Checkout abandonment

    Back in stock

    When it comes to back in stock flows, you know your recipients are invested in your products; they’ve asked to receive these updates from you.

    Lean into that hype with visuals of the product they’ve been missing.

    Then, make it easy for them to claim theirs quickly with buttons or quick reply actions.

    Best practices:

    • Use urgency in your text and call-to-action labels.
    • Showcase your image with a single product card.
    • Encourage more purchases with a quick action to view similar options.
    RCS back in stock

    Upsell or cross-sell

    When someone engages onsite or completes a purchase, this is a great moment to encourage further action.

    Visuals of recommended items to buy next can spur purchase consideration, and buttons and quick replies make taking action seamless and intuitive.

    Best practices:

    • Trigger these messages to align with specific past action (e.g., post-purchase or order confirmation).
    • Use single cards or carousels to show 1 or multiple recommendations.
    • Use personalization in tone and copy.
    RCS Upsell Cross-Sell

    Customer service conversations

    K:Service features, like Customer Agent, make the shopping process easier and more tailored than ever.

    Deliver helpful guidance and resolve questions through RCS, which enables you to provide helpful images, intuitive next steps, and easy two-way conversations.

    Best practices:

    • Optimize your content for Customer Agent. To do so, you should:
      • Use simple and straightforward language and format.
      • Restate the question in your answer for clarity.
      • Keep your responses factual.
    Customer conversations via RCS message

    As a reminder, while the examples above feature Single RCS with rich media, there are a number of great use cases for sending Basic RCS (plain text) as well. Some messages don’t need media to enforce the message; in fact, if it’s not relevant, it’s just distracting and may turn someone away from engaging. Some use cases that benefit from plain text messages are:

    • Time-sensitive updates
    • Flash sale reminders
    • Order confirmations

    Also keep in mind that in the US only, Basic RCS can be sent with buttons that send recipients to URLs.

    Best practices for designing rich cards

    When adding rich cards to your message, intention is key. The design of your rich cards directly impacts how compelled a subscriber may feel to engage and eventually convert. To ensure you’re creating content that lands, follow below best practices for building effective rich cards.

    Because Apple’s implementation of RCS isn’t fully mature yet, some features may render inconsistently on iOS. It’s recommended that you test across devices and report any issues to Apple. Review RCS known limitations on iOS.

    Media sizing and resolution

    For RCS messages, design your media with the following aspect ratios:

    • 4:3 or square, for both iOS and Android devices.

    Doing so helps ensure optimal display across devices.

    To prevent important visual elements from being cropped or obstructed by UI elements, maintain a minimum 5% safe zone on all sides, keeping the main subject in the image centered.

    Files can be up to 10MB in size, allowing for high-quality visuals while still supporting efficient delivery.

    For best performance and visual clarity, an optimal resolution of 1440 × 720 px is recommended.

    Media types

    RCS messages in Klaviyo support the following media types:

    • Image: PNG, JPG, JPEG, GIF, WebP (note: GIFs are not supported on iOS and will render as static images)
    • Video: MP4, MPEG
    Title and description guidelines

    When crafting your title and description for your rich card, keep the following guidelines in mind:

    • Title: Up to 200 characters
    • Description: Up to 2,000 characters

    As a best practice, do not exceed more than 3 lines for your title and description combined.

    Button configuration

    While you can include up to 4 buttons per rich card, 1 CTA button per card tends to perform better than multiple.

    Keep your button labels clear and concise, and aim to stay at or under 25 characters.

    Identify RCS use cases within your text messaging strategy
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