I guess we all know know what data share is… in
summary it means sharing your available DATA to
friends or anyone..

MTN

Note: You can’t share Bonus given to you by MTN, You can only share DATA you subscribed for.

How to share MTN DATA?

To get started, simply: Subscribe to any MTN Data plans.
1. Dial 131*2*1# or text REG to 131; to register for MTN Data Share, you will receive a unique security PIN
2. You are required to change the system generated
PIN to a new PIN you can easily remember by dialing *131*2*5# or by texting Change OLD_PIN NEW_PIN NEW_PIN to 131. E.g Change 0000 1234 1234 to 131. Where 0000 is old PIN and 1234 is your new PIN.
3. After changing the PIN, you are required to add
beneficiaries to your MTN shared Data Bundle account
via USSD menu *131*2*2# or by texting Add to 131. You can add up to 5 beneficiaries at a time.
4. Once you have added beneficiaries, you (the
sponsor) will be able to share your available data
bundle among the added beneficiaries by sending the
keyword Share to 131 or simply dial USSD code *131*2*3# .

Note: You cant share less than 1gb data.


Etisalat
It’s simple and straight forward, follow the below
procedure to transfer data between etisalat lines.

Dial[b] *299*Reciepient’s Phone Number*Data amount (in MB)*PIN#[/b]

Say you wish to share 50MB bundle with 08091234567, all you need do is dial *229*08095256634*50*0000#

Note that I used “0000” as the PIN above because it is the default Etisalat data share PIN and you should
replace that value with your PIN if you have
previously changed it.

And that’s it with transferring or sharing your
internet data bundle with another Etisalat line.

Airtel

HOW TO SHARE DATA ON AIRTEL
NETWORK
1. To transfer 10MB; dial: *141*712*11*recipient number# e.g:*141*712*11*08126629049#
2. To transfer 25MB dial: *141*712*9*recipient number#
3. To transfer 60MB dial: *141*712*4*recipient number#

Glo

How Can I Share My Glo Data?

*.To Share/Add:
dial*127*01*receiver's Glo number#

*.TO REMOVE :
dial *127*02*receiver's glo number#

IF you want to know or want to be
sure of how many people you're
really sharing your data plan with,
dial *127*00# so as to get a list of them

Source: http://www.naijafan.com/forum2_theme_111739295.html?tema=40&How-to-Share-Transfer-Data-Bundles-on-All-Networks

For the first time ever, you can link up to 20 SIM cards to one data bundle for free, thanks to MTN DataShare have waited for this for long.

This means you can share one data bundle across devices and with multiple people, reducing the chances of wasted data at the end of the month.[url][/url]http://showcase9ja.com/2017/04/04/you-can-link-up-to-20-mtn-sim-cards-to-one-data-bundle-for-free/