This sounds very interesting @Sparky and I wonder if you would be willing to elaborate a bit more on this?
Do you use "normal" US proxies when you are running your accounts on MassPlanner?
Are your SIM cards with numbers from the same country as your proxies, (i.e. US proxies on MassPlanner and US SIM cards), or are the proxies and your numbers from different countries? Since you're using data I'm assuming the SIM cards are from your home country?
Do you simply go to Instagram using the mobile browser on your phone to verify an account and using data to from your SIM to access Instagram, or do you even use the Instagram app when doing this?
If you're using a mobile browser, are you not clearing the history or anything before doing the next account?
If you're using the Instagram app, do you not do a fresh install of the app or anything like that?
Are you not entering the proxies that you use on MassPlanner in your phone settings, just the "plain" 3G or 4G IP from your SIM provider?
A few more questions, you say you have done this on more than 300 accounts...were they all PVd with one single phone?
Whats the maximum number of accounts you have verified in say 24 or 48 hours using this method?
Do you "take a break" of an hour or so between each verification or just load it up and do account after account?
Lastly, do you do any manual actions once you've verified an account using the mobile and before connecting MassPlanner again by clicking the "Verify button", and do you wait for a while first or do you do it immediately?
I really apologise for having so many questions, but I just can't get my head around how "you're getting away with this"!?
The track record of having done over 300 accounts without losing a single one clearly speaks for itself, but I just can't see it being "as easy" as you stated in your post above...
Thanks very much for sharing this @Sparky. If it's as easy as you write above there are clearly many of us who are "missing a trick" trying to use the embedded browser to verify accounts and getting many banned as soon as we connect MassPlanner afterwards!