Standardize phone numbers after libphonenumber confirms it is valid
T-Mobile USA's MMSC does not add a "+" sign in front of the "From:" number in the MMS payload. This confuses Chatty into thinking an MMS conversation and an SMS conversation between the same number to be different chats.
I think when Chatty checks for a valid number, some sort of standardization need to be applied afterwards to prevent this. I attached a picture below: