Direct links to both platforms:
iOS
Google Play
Multi Counter from Google Play.
Hey brother I believe I know you a trick for you. Download a VPN app (such as Hoxx VPN, Psiphon, Hotspot Shield VPN, or Free VPN) and change your location elsewhere. It’ll make your phone read a different IP address so 2k wouldn’t suspect a thing. Message me back if it doesn’t work, I have a few other suggestions. :)
with a deal involving buyback its all about trust. both the seller and the buyer have to trust that the other will hold up the end of the bargain. there was a post where people confirmed who they have had good transactions with but I can't seem to find it right now. depending on if the buyer has enough credits the buyback will either come before or after the initial sale, this usually involves the purchase of a common card with a BIN of the agreed upon buyback. there is a high risk dealing with people who have little post history or are newer accounts so be wary who you deal with and report any scammers to the mods.
most people just use excel and update it with every reset and order it by rarity. or if you have android /u/blibby423342 recommended a great app that can be found at this link: https://play.google.com/store/apps/details?id=akiraviola.counter&hl=en&referrer=utm_source%3Dgoogle%26utm_medium%3Dorganic%26utm_term%3Dmulti+counter+app&pcampaignid=APPU_1_XUF3Vea5G4X8oATW0IKIBA