You have to use your computer in order to setup your signal subscription, but if you use a MQL5 VPS you will not have to keep it open 24/7 in order to copy your signal trades.
Then you will be able to monitor signal's trades copied to your account, through your mobile or table using the android or iOS MT4 app.
Other ways to receive daily forex trading signal on your phone just joint into a telegram forex trading provider.
We are on MQL5.com and when we are discussing signal subscriptions, we mean MQL5.com signal copying and not any other way of distributing forex signals.
Its not allowed to promote other (external) services in this forum.