The web is accessible from anywhere at anytime so it is only logical that access to email should follow this paradigm. The advantages are numerous, but for the sake of brevity here are the most relevant two.
Mobile email can be thought of in much the same light as mobile phone calls. It is one of those progressions that seems natural, ensuring that we are always able to communicate regardless of our current location and/or access to computer/internet. Been able to always check for new mail or send off a quick reminder (even to yourself) is great. Another advantage is the fact that email is often a cheaper and more useful form of text messaging. A SMS is limited to a small amount of characters where as an email can be as long as required. With many plans now offering unlimited data usage it often be a cheaper alternative to email a friend rather than text them.
The disadvantages are few and becoming increasingly rarer. The first and foremost in my opinion would be security. Using a wireless network connection is inherently dangerous as any passer-by can easily intercept data and view there contents. Another disadvantage is the cost. Internet access, be it through phone or café, can be expensive and may not offset the advantages of having such access.
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