The supported and non supported features and for SMS in Vietnam are the following :
1) Handset delivery receipts are not reliable. In fact, All Vietnam operators do not support handset Delivery Receipts. Some routes generate network Delivery Receipt, therefore a 'positive Delivery receipt' does not necessarily mean the message was received on the handset.
2) Dynamic Sender ID is not supported.
3) Unicode is supported.
4) Concatenated Messages are supported.