sachockey, Jun 15, 2019 at 1:51 AM : I have a OnePlus 7 Pro I bought unlocked from the OnePlus website. I have T-Mobile as my phone carrier. I have been having problems calling 2 people in particular and after talking to them I found out they both have Google Fi service. Symptoms: Try calling their number and phone goes back to dial pad, or pops error saying invalid number and beeps 3 times. Things I've Tried: 1. I have removed both of them from contacts on my phone. 2. I have dialed their numbers with 7, 10, and 11 digits 3. I have dialed their number using *67 (I verified with them they aren't blocking me, but this would let us know for sure) 4. I've gone to the T-Mobile store and had SIM card swapped and network settings checked 5. I factory reset my phone Odd Things: If I call them while they are on the phone it rings through fine, but if they aren't on the phone then I get the symptoms stated above. I have tried this with both of the people I know on Google Fi, and this worked for both of them.