The advantages of Anhui Unicom's SMS signature are: 1. You can manage the signed content and applicable groups and contacts separately; 2. Multiple signatures can be set, and each signature can be managed separately, and can be added, deleted and modified; 3. Signature group settings: default signature (signatures of all called numbers), group signature (only set group signature to take effect) and contact signature (only set contact signature to take effect); 4. Signature priority: when user default, group and contact signature exist, priority: contact signature >; Group signature > default signature.