You don't always want to send calls to voicemail but sometimes you just can't answer your phone. This is why Apple has added the ability to quickly respond to voice calls with a text message explaining why you're not available. The "Respond with Text" feature allows you to use one of three pre-written Apple responses or your own personal response to reply to incoming calls. You can create up to 3 personal text responses on your iOS device by navigating to Settings > Phone > Respond With Text. From here, just tap any of the pre-written response slots and start typing to add your own.

Keeping your calendars synced between multiple devices is a great way to make sure you never miss important events like anniversaries, business meetings, book club events and so on. Your Google Calendar (or Yahoo, etc.) can now easily be added to the Calendar app on your iPhone or iPad. First you will need a Google account. Creating a Google account gives one account access to all Google services such as Gmail, Google Maps, YouTube and so on. Once your account is created, you can then sync your Google Calendar to your iOS device. This will allow you to add events from your computer which will then automatically be added to your iOS Calendar app, and vice versa. Other Google Calendar users will also be able to invite you to add events. Here's how to sync a third-party Calendar to your iOS device:

There are plenty of reasons to start a second Instagram account - one for your business, separate from your personal; one for your alter-ego; one for your pet perhaps... Whatever your reason, Instagram allows you to have up to five accounts, you'll just need a separate email for each one. You'll need to know how to manage multiple accounts as well - you used to have to log out and log back in, but you can now simply toggle between them. Here's how to open a second Instagram account on iPhone and iPad, and how to switch between accounts:

Blocking a phone number on iPhone makes it easy to avoid unwanted calls. But how can one begin accepting calls from a number that has already been blocked? Maybe you've buried the hatchet with an old enemy, or accidentally blocked your mother-in-law's phone number. Unblocking a contact on iPhone will restore incoming calls from that number immediately.

There may be times when you want to make an anonymous call - perhaps you are shopping around and don't want to give a business your number, or maybe you think somebody is avoiding your calls when they see your name come up. Whatever the case, there are a couple of ways you can block your number from showing up on the recipient's Caller ID. You can either block your number on a call-by-call basis or you can have your number blocked by default and let it be shown on a call-by-call basis.