Use A VPN
Tunnelling your device through a Virtual Private Network helps boost your data connection since your device would now be accessing the Internet from servers of other countries thereby making your connection fast. The best VPN apps I recommend are Tunnel Bear , Surf Easy and Droid Vpn. You can get all this on the play store
Use Different Access Points
It's possible that you might be browsing with your phone and your connection becomes slow what you do is simply go to your access point settings then switch to the other access point.
MTN Nigeria has two Access Points you can configure yours from the Screenshots Above
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