My Digi postpaid (under my dad name) is experiencing some serious lagness in 3G, my active area is menara maybank, setapak, Cheras and maybe Sg Long area in near future.

Should I switch to Maxis or Celcom postpaid? Budget no issue looking for coverage stability.

Can I just print my dad latest bill and change in Maxis/ Celcom booth?

Thank you Ya.