OpenAI brings its Bing web browsing feature to the ChatGPT iOS app for Plus users. You will need to enable web browsing with Bing in the "New Features" section of the ChatGPT app using the model switcher. No word yet on an Android app, which is still "coming soon".
Bing has been ChatGPT's default search engine for ChatGPT Plus since May. Using Bing exclusively, due to OpenAI's close partnership with Microsoft, enables ChatGPT to get additional information from the web that is more current than its training data, which ends in September 2021. The long-term vision is that web-enabled LLMs can become valuable everyday assistants, perhaps even replacing searching.