You'll have to buy Terraria again on Mobile if you want to play the Mobile version of Terraria. It isR$4.99 on Mobile instead ofR$9.99 for PC if I recall.
Currency
Current Price
Converted Price
U.S. Dollar
$9.99
$9.99
Russian Ruble
385
$4.23
South African Rand
R 100.00
$5.34
South Asia - USD
$5.49
$5.49