basically most of the android phones had more then 1 GB of internal storage
Bot still some of the lower range devices dose not have enough internal storage which restrict the number of apps to install.
so, here i will tell you how can you overcome from this problem

you just need 2 things
1. Your phone to be rooted {if not click here to know how 2 root your android device}
2. DS app2SD [ click here to download ,or you can download it from play store]

So , I have already show you the method to root your phone in my previous post
HOW 2 ROOT ANY ANDROID DEVICE

now , after rooting your phone
install DS app2SD on your device
then, open ds app2SD