I was a bit suprised as well when i noticed this option is not available in the MR6400

Exactly, i think Kevin misunderstood what you meant when starting this thread.

When roaming (not being in home country) nearly every cellphone offers the possibility to manually choose the network operator of your choice after doing a "network scan", similar as doing a "site survey" to find wifi access points.

When at home you are only allowed to choose the operator you are having a contract with.

Being able to choose another available operator via a dropdown menu can indeed help finding the fastest available network for that particular location. 

@Kevin_Z 

Hello

Is anything new in this topic - any news from  R&D team work?

@Archer200User  Same issue for me and question to all if there has been any update or new feature to be able to select mobile network while roaming?

@Archer200User 

Looks like this is sorted - if you update to the latest firmware you can now choose the network operator - go to Advanced > Network > Internet and under Dial-up Settings you can change network search to manual.

Thanks Tp Link!

@Archer200User thanks for this. It sounds great, however I don't think there is a new firmware upgrade available. 
I have searched for it online as well as it the control dashboard, but there doesn't seem to be a new release.

Can you tell me where you found the update?

@Remyduthcy Hi.  I just updated the firmware through the GUI - Advanced > System Tools > Firmware Upgrade.  The version is 1.17.0 0.9.1 v0001.0 Build 200526 Rel.36799n

Under Advanced > Network > Internet, under dial-up settings I am able to select between automatic and manual network search.  Selecting manual shows the list of network operators to choose from - e.g. Vodafone, EE etc.  Screenshot below.  Do you not see the same?