In Burp Suite, you create a replacement rule under Proxy -> Settings, on incoming headers. Put the string for your current phone in the match box, and the string you want to replace it with in the replace box. In Canape, there are a few ways to create a simple replacement filter; I don't have it in front of me but it's really easy to find.
Intercepting proxies are not terribly fancy software. There are basic ones written in Python out there that you could easily adapt and modify to include a simple string replacement.
Intercepting proxies are not terribly fancy software. There are basic ones written in Python out there that you could easily adapt and modify to include a simple string replacement.