3 non-traditional forms of credit (called trade lines) of 12 months old are needed.
The most commonly accepted and easy to document ones, in order, are:
1. Rent (if you pay to a private individual, cancelled checks are also needed)
2. Utilities (gas, electric, water, landline home phone, or cable TV)
3. Insurance (non pay-roll deducted medical, life, auto, renters)
4. Child care payments made to a business
5. School tuition
6. Retail stores (department, furniture, appliance, specialty, rent-to-own, internet/cell phones)
7. 12-month savings pattern evidenced by regular (at least quarterly) non-payroll deposits
8. Personal loans with evidence of payment terms and 12 months canceled checks
Your credit card that is 10 months old will be at least 1 month older by closing, and if you aren't already under contract yet it may very well be 12 months old by the time you close. If you need that particular trade line to qualify then you may want to ask if they can just make it a condition that the trade line needs to be 12 months by the time you close - allowing to you be pre-approved but putting a limitation on how soon you could close.
The rental history from your prior landlord could be used if you have copies of the cancelled checks you paid rent with as well.
The union dues could also be used if you can document the paper trail for the payment history.
Cell phone can only be used if your name is on it, however if you can show paying X amount per month to the other family member in the form of a cancelled check then an underwriter may find that acceptable.
Not knowing if that is the issue or not makes it tough to give more specific advice.