GUYS! Do you let your girlfriend/wife check your phone?

yes/no?... why/why not?... GIRLS yall can respond as well.... UPDATE!: In the beginning of our relationship he wouldnt care if I had his phone... which in the beginning I only looked through it once... that was in 2013.. I trusted him and he did nothing he didn't even have no social media............. in the middle of our relationship around summer of 2017 we were at his friends house and he gave me his phone to hold it cause he was playing basketball............ by this time I knew he had a Snapchat and before I didn't mind it cause I (thought i...) knew that he'd never cheat on me or talk to other girls... cause he didn't talk to no girl friends in the beginning of our relationship and I didn't have no guy friends that much so we kept it that way....... ANYWAY.. going back to his friends house, I was bored just watching them play basketball so I went in the house to watch tv.... and I decided to check his phone and everything was fine until I went on his Snapchat and that's whe it all started.. I saw that he had alot... but I mean A LOT of girls... girls that I not even him know personally... this is just how it all started.. just saying😔