The biographical and historical details from this site that relate to the 1987 edition of Hymns Old & New are available in a free app https://go.glideapps.com/play/SmjnhTFbjAgPDUf6yRHn
If you copy this link into your mobile phone browser (e.g. Chrome), you should see a message "Add Hymns Old & New 1987 to Home Screen"
if you click that message it will be installed as a permanent app.
Otherwise you can just bookmark the link and open it in your browser any time.
An official 'Digital Hymn Book' mobile app is available from R L Allan https://www.bibles-direct.co.uk/products/?c=91
This app currently includes music for English, French, Spanish, Russian and Greek editions of the hymnbook.
The cost is GBP6.00