How many accounts is ideal to keep on one Phone

You can use two or three different Reddit accounts on the same phone, as long as those accounts remain in good standing. However, if one of them gets banned, the others may also be affected.

kookeey said:

Keep a maximum of 1 to 2 accounts per phone, but absolutely do not use them to upvote or interact with each other, as Reddit's vote manipulation detection will instantly ban your entire network.

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Ok got it. I just bought a phone farming device with 20 phones installed.
I own a household appliance company so my idea is to promote my product.
What I will do is using these 20 accounts to post things like "Shall I buy ...", "My experience of brand xxxx".
But I won't comment using 20 accounts each time. I think I need to randomize which accounts to engage with each other.

Also I think I shall engage in other irrelevant subreddits just to give more of a "real" human profile. rather than someone who only post about my household appliance brand

I think not more than one on each iphone

Keeping many accounts on one phone increases the risk if they are all used for upvoting each other and coordinated commenting. Instead of focusing on the number of accounts per device, focus on making each account look like a normal user would be helpful. What I believe is that the main factor is account behavior quality, not just the phone count.