On Wednesday, Liza had $800 - $450 = $<<800-450=350>>350 left in her account.
After depositing on Thursday, she had $350 + $1500 = $<<350+1500=1850>>1850 in her account.
On Friday, she paid a total of $117 + $100 = $<<117+100=217>>217 for her electricity and internet bills.
So, $1850 - $217 = $<<1850-217=1633>>1633 was left on her account on Friday.
After paying her phone bill, Liza has $1633 - $70 = $<<1633-70=1563>>1563 left in her account.
#### 1563