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Personally, I feel that your spouse should have access to your phone at all times of the day. When you're a couple, your business is no longer just your business. Your business, your friends, every aspect of your life is shared with someone else so it's only right for you to share access to your phone which is basically the electronic hub of all your affairs with your partner.
Of course, just like all other things in life, there might be situations where you might want to hide something from your spouse, like a suprise or information that they're not yet ready to know. These are things that happen. But for the better part I see no reason why your partner shouldn't have access to your phone. The only reason you'd want to hide phone from your spouse is to hide things from them. And if their finding out would jeopardize your relationship then you shouldn't be doing it to start with and you're already wrong.