I was able to order from phone yesterday too.
For those who will order and will be impatient, know the following for your peace of mind:
1. The order confirmation email won’t come until payment is made and is detected by the blockchain. (I personally chose 24 hour non-rush method to ensure it doesn’t take off from sending amount by the time it goes to Opti.)
2. While sending BTC, just type the exact amount of BTC it says for the payment screen to detect you payment. Sending a few dollars extra to make up for any additional fees can lead to mismatch and can make you not get the confirmation screen.
3. With the 24 hour transaction time, it took me 40 mins until blockchain detected an incoming payment and I finally received an email confirmation.
4. Once the payment is detected incoming, it will clearly state that it hasn’t been received and the screen will refresh once it has been received, so if you want peace of mind, don’t close that tab.