If you recently purchased one of Apple's new iPhone 11 models, or any other model for that matter, you really should protect it with a quality case. Even if you don't mind a few scratches and dings, you are going to want to protect your investment's resale/trade-in value, which will come into play the next time you want to upgrade your phone, considering how expensive they are these days.
iPhones in recent years have gotten quite big, including the iPhone 11 series. Adding a case makes them even bigger and/or bulkier, but at their hefty prices you definitely want to protect your investment from scratches, dents and cracked screens, if not for your own satisfaction, then at least to hold resale value. So if you are going to add some more bulk to your iPhone, why not lose some elsewhere by getting rid of your wallet? If you typically get by just carrying plastic or a little bit of cash, there are plenty of iPhone cases that double as wallets.
The new iPhone lineup ranges in price from $700 for a base level iPhone 11 to a whopping $1450 for a fully loaded iPhone 11 Pro. Whichever model you have, you are going to want to protect it from dings, scratches and dirt, if not for your own sensibilities, then for those of potential buyers when you are ready to upgrade.
The iPhone 11 has arrived in stores, and like other recent iPhones, most of the device is glass. This design provides for a large display and wireless charging, but it can also leave the iPhone vulnerable to impacts and scratches. For damage and drop protection nothing comes close to using a sturdy case on the iPhone 11. That being said, screen protectors are another option that can be used in conjunction with a case or by themselves.
Yes, almost all iPhone 11, iPhone 11 Pro and iPhone 11 Pro Max models purchased from Apple are unlocked. Unlocked iPhones may come with a removable SIM card preinstalled, but they are not bound to a specific wireless network or carrier.