Well, if the cracks are minor, you can very well slap a protective case on and live with it. Back glass replacement service is a fairly complicated one - the entire phone has to be disassembled, so that comes with a little risk. Also, after glass replacement, it’s not exactly the same in feel and finish.
If the back glass is completely shattered, there’s really no other option but to get it replaced.
In some cases, if the damage is too severe, it may even be infeasible to replace the back glass - we may need to replace the entire housing.
For cost and best advice, please feel free to get in touch with us.