With iOS 18, Apple introduced support for RCS messaging, a new protocol that enhances the texting experience between iPhone and Android users. Unlike SMS, you can see read/delivered receipts, send larger files, and have typing indicators, features that were previously missing. At first, only the big three carriers supported RCS messaging. Since then, a lot more have joined in on the fun.This list is based on information directly from Apple, and will be updated as new carriers are added.Supported carriers:AT&TC SpireConsumer CellularCricketFirstNetH20 WirelessMetro by T-MobilePureTalkRed PocketSpectrum MobileT-MobileTracFone / Straight TalkUS CellularVerizonVisibleXfinity MobileThis is obviously far more than what we had at launch, which was primarily just AT&T, Verizon, and T-Mobile. Theres a lot more support from MVNOs (mobile virtual network operators, ie small carriers) but it still isnt very complete.Some notable exceptions from the list are Boost Mobile, Mint Mobile, and Ultra Mobile. Boost Mobile is the fourth largest US carrier with over 7 million customers, and havent yet supported the feature.Mint Mobile and Ultra Mobile are particularly interesting because they were both acquired by T-Mobile earlier this year, but seemingly T-Mobile hasnt yet gotten around to supporting the feature on its new sub-brands.Have you gotten to use RCS messaging with iOS 18 yet? What do you think about it? Let us know in the comments below.My favorite iPhone accessories on Amazon:Follow Michael:X/Twitter,Bluesky,InstagramAdd 9to5Mac to your Google News feed. FTC: We use income earning auto affiliate links. More.Youre reading 9to5Mac experts who break news about Apple and its surrounding ecosystem, day after day. Be sure to check out our homepage for all the latest news, and follow 9to5Mac on Twitter, Facebook, and LinkedIn to stay in the loop. Dont know where to start? Check out our exclusive stories, reviews, how-tos, and subscribe to our YouTube channel