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Which one are the most important? Email or mobile number? I've seen facebook do let user choose either to register to use mobile number or email. Any Ideas?

Currently I'm doing registration for parents and students....

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I can't help feeling that if you can't answer this question yourself, then you don't know what you are going to use the data for even when you have it.

Maybe if you think about what data you actually need it might help? Do a little role playing where you put yourself in a position where you actually need to make use of this information in different situations.

Then, let's say for example you're going to put an information box next to the field on the registration form, and in the info box you're going to tell the user why you need the email address or why you need the phone number. What copy would you put in the boxes to make them want to part easily with the information.

Once you have that conversation with your registrants you might find the answer to your question just falls out of the box.

Maybe both are useful. Maybe one is a fallback for the other. Maybe one is good for general notifications and the other is for more urgent contact. Maybe one is for digital contact and the other for human contact. Or maybe you just let your users decide rather than making the decision up front for everyone.

What I'm saying is: given the information available, only you can answer this question for your particular scenario.

Which one is the most important? It depends! No really - it does.

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  • Or maybe one is to filter out people who are not affluent enough to subscribe to unlimited SMS from becoming users of your site. I imagine that more affluent people are more likely to actually buy something (or to click ads and then buy something). Commented Jul 3, 2015 at 17:25
  • @tepples Umm... what? You just made two very large assumptions and did not add anything to this very good answer. Commented Jul 3, 2015 at 19:35
  • Maybe he doesnt need any of it. On reddit the E-Mail adress is optional. You can create an user account with username and password only if you want to
    – BlueWizard
    Commented Jul 5, 2015 at 6:10
  • @ZachMierzejewski I'm referring to things that aren't phone apps or dependent on phone sensors but still require a mobile number, such as Yahoo! Mail and the comments section of The Huffington Post. My assumption was that ad-supported services want mobile numbers so that they can assure advertisers that their users are rich enough to have their own cell phone, not share a phone with anyone else. Commented Jul 5, 2015 at 12:34
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Mobile numbers can get replaced by messaging platforms in a foreseeable future. Emails are here to stay.

In many countries mobile phone number has to be linked to a passport or other real ID.

If a website is mobile first, or it's a mobile app itself, phone number authentication is expected, but user must be given a choice.

Linking to the mobile number, we bind users to their physical devices, limiting their chance of logging in when phone battery is dead, or phone gets stolen.

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  • I interpreted the question as whether a user should be identified with an email address or a mobile number (or maybe neither: a username), not using the device to log in with. In the UK, ID is not required for a pay-as-you-go phone; the number is portable between providers. A person may have many email addresses and forget which to use, or change email providers and their address. A mobile number is more permanent than an email address. Commented Jul 3, 2015 at 11:06
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    @AndrewLeach It's worth noting that numbers aren't guaranteed to be portable, that a number is only linked to 1 device at a time, and that users have limited choice over when and how they can switch. Email is far more flexible: your old address is still accessible after you migrate, you can register a new address wherever and whenever you want, you can auto-forward, etc.. Whether a number is more permanent than email depends entirely on the user. But permanence, I think, should be a moot point, because shouldn't the service always allow a user to update their information when it changes?
    – nmclean
    Commented Jul 3, 2015 at 13:47
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    @AndrewLeach There's also people with no mobile number. i would also be much less leniant to provide a phone number to a random website.
    – Ángel
    Commented Jul 3, 2015 at 15:21
  • All of these are reasons for not using either an email address or a mobile number at all, but instead using a username (which a user is less likely to change, having chosen it). Commented Jul 3, 2015 at 15:37
  • @AndrewLeach You need at least one foreign key for password reset. Commented Jul 3, 2015 at 17:28
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I assume you’re designing a public facing web site, where your target is to let new users register to be able to access content. And you want to decide whether to use Email or phone number when they register. If your goal is to get as many users as possible, my recommendation would be to use both. Some users like to register with their Email address and others there phone number.

The issue here could be that it takes longer to implement two registration channels: SMTP connection and SMS service. But this is a project cost and implementation time problem that is subordinate to the user experience question, in my humble opinion.

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If you're only able to do one, I'd go with email. Mobile number is very personal to a lot of people; they are concerned about spam calls. Sure spam emails are a problem too, but they don't demand time in the same way as a phone call. Also Facebook is a well-known name - providing your phone number to them will be regarded as 'safer' than to a smaller, less-known site.

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  • That and a lot of people in the United States market still have land lines or pay for incoming calls and texts. Commented Jul 3, 2015 at 17:27
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Keep in mind that depending on the age of the students not all of them will have a mobile number, so you'll either need to allow a phone number (the parents) be used for more than one account or have email as a secondary option. I think the key point you're missing is that facebook lets the user choose if they prefer to use an email address or mobile number.

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