The problem of mobile phone dynamic memory and phone book SMS capacity

Text messages within 70 characters, generally 0.5KB. The capacity of MMS depends on the specific size, because MMS messages vary in size.

A phone book entry is calculated as 0.2 to 0.4KB. Because some names have multiple phone numbers under them, the sizes vary. If there is an incoming call picture and a personalized incoming call ringtone, it will be larger. The specific size depends on the size of the picture and ringtone.

1M is equal to 1024KB. Just convert it yourself.