Yes. You can have as many subscriptions as you like.
If you buy an identical subscription to one you already have (the same country and same number of minutes), the second subscription will only become active when the billing period for the first subscription expires, and not when the first subscription has run out of minutes.
Skype uses subscriptions in the following order:
- By subscription type – unlimited subscriptions are used first, then limited ones.
- By expiry date – subscriptions with the nearest expiry date are used first.