S6 Duos, how to move contacts between the two sims?

[Anduse10]

I have had this phone for 3 months. Now I noticed that I don't know where are my contacts saved (in terms of sims) and I would like to know this, plus to be able to move my contacts between the sims, so that each contact is saved in the sim I want it to be saved on. Thanks

 

[Rukbat]

Keeping contacts on SIMs is a leftover from the days that the SIM was the only storage available on the phone. Export the contacts on the first phone. Import them, but import them to your Google account.

On the second phone, add the same Google account (not Gmail account, even if it's the same address - the Google account.) Sync the contacts, and they'll be on the second phone. (If this is for a 2 SIM phone, just having the contacts as Google contacts means that either SIM can use them.)