It's a matter of how comfortable you are with someone having access to your bank account.
If you believe it's unlikely anyone will ever either A. work for a telecom company, or B. build an OpenBTS base station, while also C. try to get into your bank account, then you shouldn't worry.
If you believe it's unlikely anyone will ever A. work for an ISP or other mail relay, or B. sniff traffic on a network segment that an unencrypted mail relay runs on, while also C. try to get into your bank account, then you shouldn't worry.
Now then. If you think both of those are likely to happen, you can simply use a one-time pin program on a phone (or a keyfob -- much more secure than on a phone) and neither of the two attacks will be possible, thus your bank account will be more secure.
It's only a matter of how much you care about your bank account. If you care enough you won't use e-mail or SMS. If you don't care, then whatever happens, happens.
If you believe it's unlikely anyone will ever either A. work for a telecom company, or B. build an OpenBTS base station, while also C. try to get into your bank account, then you shouldn't worry.
If you believe it's unlikely anyone will ever A. work for an ISP or other mail relay, or B. sniff traffic on a network segment that an unencrypted mail relay runs on, while also C. try to get into your bank account, then you shouldn't worry.
Now then. If you think both of those are likely to happen, you can simply use a one-time pin program on a phone (or a keyfob -- much more secure than on a phone) and neither of the two attacks will be possible, thus your bank account will be more secure.
It's only a matter of how much you care about your bank account. If you care enough you won't use e-mail or SMS. If you don't care, then whatever happens, happens.