Phone makers keep searching for ways to add features without bulking up devices. The latest efforts center on magnetic attachments that snap onto the back. One brand just turned that idea into a real product. Another showed how far the concept could go.
OPPO launched the Bubble, a magnetic rear display accessory that pairs with its Reno 16 smartphone and other models. The 1.73-inch AMOLED touchscreen offers a live preview from the phone’s superior rear cameras for better selfies. Users can also treat it as a detachable remote. It streams video up to 10 meters away. And it supports custom wallpapers or plays videos when the phone sits idle.
The accessory weighs 27.5 grams. It measures 7mm thick. A 550mAh battery keeps it running independently. IP54 rating adds dust and water resistance. Android Authority highlighted its appeal as both a practical tool and a fashion item that can hang from clothes or cases.
This arrives at a moment when rear screens have popped up in various forms. Honor reportedly plans a similar magnetic display for its 600 series. That accessory would double as a selfie mirror, remote shutter and wallpaper showcase. A Weibo post from Fixed Focus Digital first teased the accessory’s arrival. Android Authority noted the appeal of removable designs over permanently built-in rear displays found on devices like the Xiaomi 17 Ultra or Nothing Phone 4a Pro.
But OPPO’s move stands out for its immediate availability. The Bubble goes on sale in China on May 29 for CNY 499, about $75. It works with a range of OPPO and OnePlus phones, including the Find X9 Ultra and OnePlus 15. No plans for global release have surfaced yet. The author at Android Authority expressed clear frustration that Samsung and Google have yet to offer anything comparable in the US market.
Meanwhile, a bolder vision unfolded months earlier at Mobile World Congress. TECNO unveiled its Modular Magnetic Interconnection Technology alongside a wafer-thin concept phone. The base device measures just 4.9mm thick. Bronze-colored magnetic pads dot the back. Modules snap on securely and connect through a hybrid system of magnets and electrical pins.
Power travels through those physical contacts. Data moves wirelessly via Wi-Fi, Bluetooth or mmWave depending on conditions. The result keeps the combined thickness close to that of a typical smartphone. A 4.5mm battery module, for instance, adds capacity without turning the handset into a brick.
TECNO showed more than ten modules. Options include extra battery packs, telephoto lenses, action cameras, external microphones, speakers, even a full camera body with 20x optical zoom and manual focus. One demonstration turned the phone into a walkie-talkie with an added antenna. Another stacked multiple batteries for extended shoots. Tom’s Guide reported the hands-on experience left staff impressed. The writer admitted liking the concept more than expected. The assembled device felt powerful despite added weight.
Past modular experiments offer cautionary tales. Motorola’s Moto Mods and LG’s dual-screen G series both faded away. Bulk, cost and limited module support doomed them. TECNO’s approach tries to sidestep those problems by keeping the core phone extremely slim and relying on wireless data transfer for many functions. The telephoto module, for example, uses the main phone screen as viewfinder with low-latency preview.
AI elements appeared in TECNO’s broader showcase too. Edge-side generative tools ran style transfers at 30 frames per second using compressed models that work offline. The company positioned the whole system as a way to evolve hardware as quickly as software updates. Users attach only what they need for a given task. Photography enthusiasts grab lenses. Gamers add controllers. Travelers snap on power banks.
Yet questions remain. Will these modules stay affordable? How will owners store and transport a growing collection of add-ons? And can the magnetic connection survive daily abuse? TECNO presented everything as concepts. No commercial launch timeline has emerged. Still, the demonstration signaled serious engineering investment.
Smaller magnetic accessories have already reached consumers. Insta360’s Snap offers a 3.5-inch touchscreen that attaches to MagSafe-compatible phones. It draws power through a USB-C cable for lag-free rear-camera preview during vlogs. Reviews praised the stability but noted battery drain of 15 to 20 percent during extended use.
The pattern feels familiar. Chinese brands experiment aggressively. OPPO ships a finished accessory today. TECNO dreams bigger for tomorrow. Western manufacturers watch from the sidelines. Some analysts wonder whether consumer demand will ever justify the added complexity and supply-chain demands.
But demand signals exist. Selfie culture drives interest in better rear-camera previews. Content creators want remote controls and secondary displays without carrying extra gear. Power users crave upgradeable hardware that avoids annual full-phone replacements. Magnetic systems deliver on those points with minimal compromise to the primary device’s slim profile.
OPPO Bubble proves the accessory approach works in practice. Simple attachment. Useful functions. Reasonable price. If early sales in China succeed, expect more brands to follow. Honor’s rumored accessory could accelerate that trend. And if TECNO eventually converts its concept into production modules, the entire category might expand dramatically.
Phone design has felt stagnant for years. Glass slabs with incremental camera bumps dominate. Magnetic rear screens and modular attachments offer a different path. They promise personalization without forcing every user to carry unused hardware. The technology isn’t new. Magnets have powered accessories for years. Yet the combination of thin base devices, reliable connections and practical modules feels fresh.
Success will hinge on execution. Modules must deliver clear value. Connections cannot fail at critical moments. Pricing needs to stay accessible. And software support must keep pace so that new add-ons work smoothly with future phones. OPPO has taken the first real step with a product consumers can buy. TECNO has sketched an ambitious map of what could come next.
The industry now waits to see whether major players copy the idea or dismiss it as a niche experiment. For now, the magnetic pull grows stronger.