If you can text then you must have a current membership. Your online account should clarify what it is and when it expires. What does your online account say about your membership status, expiry date and calls/texts/data/credit balances?
If you can't call then you may have used up your call allowances. In which case you may need to buy a calls add on. Buying a new membership now will not prematurely end your current membership & give you calls. The current membership still has to run its course.
If your gf did use the correct number to buy you membership then it will have stacked for use when your current membership expires.
Hope this helps.
