To use Snake on an iOS device, you will need to use an app called "Could Phone" available on the app store

https://apps.apple.com/us/app/ecalc-cloud/id6480498799

This service costs about $2 per week and allowed you to have a virtual android device. 

Important Note: If your cloud phone expires, renewing it may cause your snake id to change. This would mean that any active subscription with snake would be lost. Don't buy a subscription that lasts longer than your cloud phone plan. Fair warning.