I do not think mining with more than one device will make any significant increase. The technology must have put these factors into consideration, before set up this platform. People have tried it, and it did not work.
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I tried using two mobile devices to mine Bitcoin on Cryptotab but couldn't make any significant difference, it is like the speed is just the same as when I was using one phone. Please is there anyone here who have used or is using more than one device for Cryptotab? kindly share your experience.