Free £5 Credit for registering

[Michael_Dab]

Hi,

I'm on classic PAYG and understand I need to make a chargeable call within six months to keep my sim active. I have registered my number with O2 and received received £5 free credit which I wasn't expecting.

However I'm a very light user and it's likely that I won't use all of the credit in the six month period.

My queries are:

Do calls using the free credit count as a chargeable call?

Would topping up my sim within the six month period keep my sim active?

Does O2 give prior warning that they are going to disconnect a sim?

While I may not use my phone very often I rely on it for emergencies and various logins for internet services.

Any help would be appreciated.

[MI5]

@Michael_Dab 

Do calls using the free credit count as a chargeable call? - Yes

Would topping up my sim within the six month period keep my sim active? - Yes

Does O2 give prior warning that they are going to disconnect a sim? - No

[gmarkj]

Other members who have an emergency phone set a recurring reminder every 5 months or so to send a test message to themselves to keep the sim active.
Would that be an (annoying) option @Michael_Dab?