Yes.  Mobile accounts are treated as if they are separate trunk and so will need to be migrated also.  You will see that mobile accounts are usually in the format '' and which account / DDI this reference relates to can be found on the 'Mobile Accounts' and 'Numbers' tabs.  Migrating a mobile account is just a single step process (refer to Step 2 of Migrating Your Clients' Trunks) as you do not need to amend any PBX settings.