OK I am trying this once more. I recently discovered that my prepaid plan is not a flat rate plan. I signed up for it with Check 24. At that time, it was shown as being flat rate. I have never had any trouble until recently, when I had to make a lot of phone calls. Normally I only use Whats App.
I wish to change to a contract plan, but when I try that on mein O2, I see a message to dial 107 and use the app. I do not quite understand. My German skills are very poor, and google does not translate properly into English. I am going on a trip this weekend, and will need to make phone calls. I am afraid of running out of minutes. If I manage to change my plan now, will it disconnect me? Will I need a new SIM Card? Sorry, I am 74 years old and all of this is quite confusing to me. Any help, I would appreciate.