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I do a lot of work using the on-screen keyboard on iOS, but nothing beats the speed, accuracy, and feel of a real keyboard.
If you can find a keyboard-and-case combo that you like, then you might be able to combine the two, saving weight and improving ease of transportation. For me though, I prefer the Apple Bluetooth keyboard. At $69 these keyboards are not cheap, but you do get an excellent piece of kit of the money.
Image source: Apple.
One of the major drawbacks of relying on portable devices like the iPhone or iPad is that you're totally reliant on the built-in battery. Once that hits empty, you're done for the day. Fortunately, there are portable battery packs that allow you to keep your iPhone and iPad topped up throughout the day so they're always ready for action.
One such portable battery pack is the New Trent iGeek. This offers 9,900 mAh of power and it compatible with the iPhone 4S and iPhone 5 and the iPad 3, iPad 4 and iPad mini (as well as any other device that can be charged from a USB port, so long as you have the appropriate cable). It's fitted with two USB ports so you can charge two devices simultaneously.
It will set you back $65.95, but it will keep all your gadgets charged up and ready for use.
Image source: New Trent.
The Jawbone Era is the best, clearest, most comfortable, and easiest to use Bluetooth headset I've used -- and it only costs $99.
Call clarity is taken care of by the military-grade NoiseAssassin 3.0 noise-cancellation and wind reduction technology. The built-in 10mm wideband speaker allows you to listen privately to music, podcasts, YouTube videos, sports, phone calls, Skype calls, and more, all in full-spectrum, high-definition quality sound.
To top all that off, the Jawbone Era supports a whole range of downloadable apps and voices.
Image source: Jawbone.