My girlfriend (of several months) asked me why I don't call/txt her more often. Its not like I'm going days without responding. Sometimes a few hours. We usually send a few fun/flirty/playful txts a day. Sometimes I won't call at night, and wait till the next day. Stuff like that. I always do answer when she calls. The reason I don't call/txt that often is that she is a very busy single Mom and a school teacher, and she doesn't respond that often as it is. That's what I told her, and she recognized that and grudgingly agreed.
Now, the general consensus is to not be overly available. Raise your value by building the image that you are a busy guy with many important things happening in your life with lots of people. Make her invest in you by trying to get your attention. So that's what I've been doing.
Still, you have to wonder in the back of your mind, if she doesn't have your attention, she can just go to some other guy and have his instead. Which is exactly the same thing us PUAs do when the situation is reversed.
So, how much calling/txting is too little? How much is too much? Where's the balance?

It all boils down to how much you care about her complaints... if you are scared that she will get the attention you are not giving her from some other dude, you will soon over text and over call her and run into the "she says I text/call too much" category... that would suck even more than not calling/texting enough...

On the other hand, by being yourself, even if that means texting/calling not enough, you will maintain the alpha attitude with your GF and she will have to eventually accept it... she will recognise you as a MAN and not pressure you anymore about the communication quantity... make sure you give her quality instead... she will appreciate it more...

hope this helps...

This is the sad truth about technology. You can get in contact with someone in seconds and keep the conversation for days. I don't like to text a lot myself, it just takes a lot of time away from my day. I don't mind talking to women I see, but I'd rather text less, maybe a few times a day.

Just be yourself man, don't worry about how many times she wants you to text her, she'll just have to wait a bit.