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Are you asking about whether you can be charged because you found information by using her SIM card? How did you obtain the card?
If you looked through her personal belongings and took out the card and if it is clear that she had a reasonable expectation of privacy because she had put the card away then it is possible that you would be charged.
However, it is exceedingly unlikely that you would be charged. The reason why is the police do not want to spend time dealing with issues that they can say are personal issues that you should taken up with the family court judge. And, the Family Court Judge, frankly, will not not care so really, you have very little to worry about.