It's rare, but if there really is no edit button, you need to download a new contacts app from play store. There are plenty of good contacts/people apps on play store that offers you even more than your stock contacts app.
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It's best to talk about this with your doctor, especially since you have a medical condition. Your doctor can provide you with the best treatment options for you, as well...
If your iPhone screen breaks, there will always be someone to repair it. Look it up on Google Maps or ask Siri for screen repair stores near you. If you...