I ordered a SIM card for a disabled friend from a phone company and paid £5.95 for next day delivery. I expected it on Tuesday, but did not receive an email with a Time slot. I spoke to someone on the phone who explained that it had missed the collection. She assured me that it would arrive today. This morning I had an email from DPD to ay that it was delayed in transit, but they had resolved the issue and it would be delivered tomorrow (Thursday). The phone company is refunding the £5.95. I do not know why companies use DPD and similar outfits. My experience is that they are much less reliable than the normal postal service.