2025年3月11日 · If you get an alert that says Invalid SIM or No SIM Card installed, follow these steps.

2021年8月25日 · We tested 15 solutions to solve your data problems on iPhone and cellular iPad. Note: Though this post focuses on LTE/4G, most fixes apply even when 3G or 5G is not working …

2024年9月17日 · If your iPhone is not showing LTE despite being in an area with coverage and having LTE enabled, there might be an issue with your SIM card. Try removing the SIM card, …

2025年9月15日 · After iOS 26 update, some users have been seeing one of various SIM card related error messages, such as SIM Failure, Invalid SIM, No SIM, No SIM Installed, etc., …

2025年11月23日 · We’ve compiled a list of eight fixes you can try to fix your phone’s LTE connection before calling your cell carrier’s customer support line. 1. Toggle airplane mode to get LTE working again....

2025年8月19日 · Check out some helpful tricks and tips to fix LTE/4G not working on iPhone. Follow these troubleshooting tips and resolve the issue now.

2025年10月4日 · Many users are rejected by the sudden removal of the LTE option from their own iPhone. Here are the possible reasons why your iPhone might be unavailable. Note: Before …

2022年8月1日 · Is your iPhone not recognizing the SIM card? Here's how to fix No SIM, SIM Not Valid, and other SIM-related issues on iPhone and iPad.

2025年9月7日 · Check your SIM card, restart, or update your carrier settings. Simple fixes often restore cellular service quickly.

2025年10月14日 · When your iPhone suddenly shows "No SIM Card installed," "Invalid SIM," or "SIM failure," it can be frustrating. These errors prevent you from making calls, sending texts, or …