Adam Breeden/ZDNETOn Monday, Apple kicked off its third developer beta of iOS 18, bringing several new tricks and a host of bug fixes. Designed for iPhone users who register as developers, the latest update adds greater carrier support for RCS messaging, changes to the Photos app, tweaks to the emoji keyboard, and new visuals for the flashlight.First on the list continues to be RCS messaging, a long-awaited feature that Apple started rolling out with iOS 18 Beta 2. Thanks to RCS (Rich Communications Service) support, iPhone users can send their Android friends messages with read receipts, high-res photos and videos, audio clips, cool emojis, and more.iOS 18 Beta 2 limited carrier support for RCS to Verizon, AT&T, and T-Mobile in the US, but Beta 3 expands support to more providers. This includes carriers such as Videotron, Telus Mobility, and Bell in Canada, as well as Telefonica in Spain, SFR in France, and O2 in Germany, according to 9to5Mac.Also: The best iOS 18 features that will make updating your iPhone worthwhileNext on the list is the Photos app. During the iOS 18 beta period so far, the new version of the app has triggered concerns from some beta testers, who’ve given a thumbs down to the new interface. Changes in Beta 3, however, show that Apple isn’t done tweaking the app.With the latest update, the handy Select button is visible all the time, allowing you to easily run commands on multiple photos. You can also now pinch to zoom in and out of your photo views. Like other beta testers, I’ve been concerned about the new look and layout for the Photos app, so I hope Apple continues to fine-tune it.The emoji keyboard is another feature that Apple has improved in Beta 3. When choosing this keyboard from the Messages app, the emoji icons are a tad larger. For me, this is a welcome change, as I sometimes have trouble seeing the finer details on an emoji I want to use in a text. More