Hello, happy to answer your questions. If the iPhone can not charge, there may be several reasons;
1. The mobile phone charger and charging cable are damaged, you can replace it and try it.
2. The charging cable, or the charging port has something dirty blocked, you can clean it.
3. Battery, or motherboard problems, if within the one-year warranty period, non-human damage can be free warranty.
4. Software issues, you can restart the phone, or update the system to the latest version. Hope I can help you!