About SMS and GPRS ...

The setting you said should be MMS. SMS has nothing to do with GPRS/GSM. Just give priority to GPRS. Now all the paths used to send MMS are GPRS. Do you have a monthly fee of 100M? Let me put it this way: 1M equals 1024K, 1K equals 1028k. 100M can download 200 mp3s. The capacity of MP3 is large enough. If you change to something else, such as ringtones, pictures, videos, games, e-books, software, etc. It goes without saying that they are all smaller than MP3, so you can download more. Anyway, if you don't play hard, you won't need much traffic in a month. If you just browse the website and look at the pictures, it can take three months. If you use up 100M before the data package fee is deducted, the mobile company will send you a message, and if it exceeds 1M, the money will be deducted. If it is not enough, it will be 1 m, and one dollar will be deducted1m. Is that clear?