The Oxycoin Mobile Platform enable users to purchase cryptocurrencies directly with FIAT - whether they have IT knowledge or not. It provides a user-friendly platform that contains all the information and tools needed by any crypto-enthusiast and puts it right at their fingertips. With OXYCOIN, users will be empowered to make informed decisions and take positions in crypto-markets effortlessly. But others like you mentioned i.e BLOCKCHAIN wallets are platforms  for storing BTC, sending and receiving BTC and not FIAT,  for other wallet like COINOMI,  you can store altcoins + BTC, send & receive altcoins + BTC.