What is the difference between dual sim active and dual sim stand-by? I am Using Sony Xperia Tipo Dual, which is Dual Sim Smartphone, but When i use internet from SIM 1 using Network Mode = GSM only or WCDMA/ GSM the another SIM's says NO NETWORK. When i deactivate my Internet i receive message's from my Network operator that you got missed calls from these numbers. GSMArena says My phone is no dual stand-by.
There are actually three types of dual SIM phones.


Dual SIM Standby (DSS): Only one SIM can be used at a time, 1 radio chip. The phone has single IMEI number.
Dual SIM Dual Standby (DSDS): Two SIMs can be used at a time, but if one opens a call or data connection, the other is offline. The phone has two different IMEI numbers.
Dual SIM Active (or sometimes Dual SIM Dual Active) (DSA/DSDA): Two SIMs can be used at a time, 2 radio chips. This enables both SIMs to open calls and/or data connection. The phone has two different IMEI numbers.


Since your phone is mentioned as "No dual standby", it means it's a DSS-phone, which allows only one open connection at a time.