I would try to pay it in full! Only making partial payments would cause you to go past due and in some cases that might put in a position where if you have a Cell phone, Cable or Lights, you service will be suspended until the Past Due and any additional Reconnect/Suspension Fees are paid just to restore service
Unless you talk with the Collections Department from the Company to set-up payment arragements, then you can make a partial payment with the rest being paid at another time.
If you go really past due, you subject yourself to have an Outside Collections Agency or Lawyers trying to collect your debt and affect your credit.
phone, insurance, etc - in full every month
credit - pay off in full every other month or so (I'm trying to build up credit - and they have to see that you can use it responsibly)
I usually try to pay a bit more on it even if it is twenty for thirty dollars. I like the sense of security it gives me to know that my phone or hydro has a little cushion to it.