Before
trying to enable 3G signal in SIM 2 slot, we have to ensure that you smartphone
manufacturer has availed this option for your phone.
You can see
it in your phone specifications in phone manual or in some online websites. It is not possible to use 3G is both sim at a time
What is WCDMA sim slot :
In Dual SIM smartphone, only one SIM slot can be activated with high speed internet or WCDMA means (Wideband Code Division Multiple Access) . In some smartphones, it is interchangeable. But in some smartphones, primary sim is WCDMA / GSM and secondary sim is only for GSM (low speed internet connection like 2G, EDGE)
If it is
clearly provided that SIM 1 Slot is for
WCDMA and SIM 2 Slot is of GSM type, then this procedure will not work most
probably.
The only
solution is to swap (Change the sim cards between the slots and use your
desired 3G sim card in Primary SIM 1 slot.
Mostly dual
SIM phones with high end specifications has this 3G Switching option and phones
in low entry level market doesn’t have this switching option and they have
primary SIM as 3G and Secondary SIM as 2G
If you hope
that your phone specification has both slots can be used as 3G then we can
proceed further.
Here we
have to note that at same time we can’t enable 3G in both SIM slots.
How to set sim2 as wcdma:
So, If you want to convert Sim 2 Slot into 3G, you have to set SIM 1 slot as GSM, then set SIM 2 slot as WCDMA or 3G
Likewise if
you try to convert SIM 1 as 3G, set SIM 2 slot as GSM first and then enable
WCDMA in SIM 1 Slot.
It is
better to plan accordingly in which SIM card, you are going to browse high
speed internet mostly, then FIX that simcard as a Primary SIM card Slot.
Changing it
often may result in confusion and it may also result in unnecessary loss of talk time.
Will GSM sim work in WCDMA slot ?
Yes, GSM sim will work in WCDMA slot. But the internet browsing speed will be according to 2G speed of the network provider
To change from 2g to 3g on a dual sim lenovo smart phone ?
- Go to Settings → Mobile networks
- In network type choose WCDMA or 3G only
- Now your phone will show H or H+ or 3G signal if it is available in your location.