My 5800 messages were suddenly preceded by +86 ... (200 points).

There is a +86 that can't be cancelled by mobile phone, which has something to do with network equipment. In some areas, 86 pieces of equipment were sent to end users, while in some areas, these devices were not available. So it's not a cell phone that can be cancelled. It should be normal to display names with +86. I remember whether machine N should handle names by looking at the last 6 or 7 digits of the mobile phone number. Our mobile phone numbers are all numbers of 1 1. Do not display names. In most cases, two or more names are stored in the same number.