I am using Bitpay on my phone and in matter of fact it's quite easy to add a new coin to your account.
You can add a new coin by clicking the
configuration/settings icon on the bottom right corner of the wallet then click on your account/wallet (key1 by default), then click on
Create a new wallet. then select the coin you want to add.
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You can also do it by clicking on the
wallet icon, click on the three horizontal dots on the top right corner then
Create new wallet.
edit: was typing and didn't notice Bitcoin_Arena's reply. Belated me by few seconds 