There are several options you can do. You can either send out a mass text on your new mobile number informing of your name and that this is your new number. I also find a mass e-mail or facebook message can do the same.
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If in doubt, check the number by using telephone directory enquiries, look up their number on their website, or ring the bank direct if you know the branch telephone number, or even pay them a visit in person. It is usually okay to phone the number given in the email, but never click on links in the email. And never give any details if asked for your bank account number, and other details - the genuine bank should all ready know such details!
Mobile numbers no longer belong to specific networks. When mobile phones first became popular, the different service providers had 'blocks' of numbers, For example T-Mobile might have had all their numbers starting 079xx. If you wanted to change your provider - you usually had a new number issued. Once the whole numbers system was de-regulated, you could take your number to a different network than the one you started with. So - your old T-mobile number could now be connected to (for example) Orange.
I've been trying to do the same. I don't know that it is possible. I've tried everything, but it seems you can only delete them one at a time. :(
make all contacts with the media
I have facebook mobile and you dont use internet its all texts