UPDATE #4
- sometimes when the data interface changes […] Or when you switch from
4G
toWiFi
and viceversa. However, after the smartphone reboot or after having switched-off the airplane mode the SIM takes a very long time to register with the 4G network then it is time to read the fixing the 4G registration section.
FIXING THE 4G REGISTRATION
The first step you should do after having inserted the SIM
into your new SFOS
smartphone is to ask your network operator to send their mobile data configuration back to your device. Usually, you can do that sending a SMS
a specific number.
This may be not enough in those countries in which 4G
service is available but not yet very well established compared to other less performant protocols still alive with their own infrastructure inconpatible with the 4G.
Before settle down accepting to surf the Internet with a 3G connection or doing a manual rescue procedure every time your SIM
needs to register, you might decide to limit your mobile data to use the IPv4
.
A free VPN may leak data over IPv6
This can be a good idea expecially if you are using a free
VPN
service that tunnel the data overIPv4
but leaks those overIPv6
.
To limit your mobile data over IPv4 proceed in this way:
Settings:System → Connectivity:Mobile network → SIM card
In the Data
and MMS
access points changed the Protocol from dual
to IP
. This should be solve the issue otherwise you have to deal with the Customer Service of your netwrok operator.