You’ll need to liaise with your husband’s employer as they need to provide documentation to allow you to be a dependant off of his visa.
My guess is that you’d probably need to leave and apply for the visa outside of Thailand but that’s going to be dependent on the company setup and their relationship with the local immigration office.
Yes. My kids had numbers under my name as they were quite young when they got their phones. Now as young adults with accounts they needed new numbers (my provider wouldn’t change registered name)
Ok. I haven’t heard of anyone needing to do that. Some have needed new phone numbers because their phones were registered to a third party but not of needing to notify bank nor phone company with any sort of form or passport copy.
They have some link to the two systems that flag numbers that aren’t in the account holders name. That’s the case with SCB anyway. It may be different for other banks.
It’s not the bank branch that need to update their system. It’s whether the phone company has your number associated with your name. If it’s not then the bank will cease mobile services.