what is the use of the LOOP option on mobile network? [answered]

@MoritzJT i don't know what is this LOOP function by O2. Don't found the definition of it by them. it is the roaming function, the ability for having access on other network? Or something which is bound to the roaming function.

Thank you very much for your together links

i don't understand why could we activate loop and could having roaming as non-active...

AFAIK Loop is just the brand name for the prepaid option of o2 (also called o2 prepaid), see for example: www.o2online.de/tarife/prepaid-tarife/o2-loop/

//EDIT: O2 Loop isn't designed for networking: "o2 Loop ist für Nutzer geeignet, die hauptsächlich telefonieren und SMS schreiben wollen und das Internet nur gelegentlich oder gar nicht nutzen. Eine Internet-Flatrate kann nicht nachträglich zugebucht werden. Es ist jedoch ein Tarifwechsel zu o2 Loop Smart möglich." - free translation: "o2 Loop is made for users who phone and wite sms mostly and who use internet rarely or never. A internet flatrate can't be added later. Anyway you can change to o2 Loop Smart."

(Source: https://hilfe.o2online.de/docs/DOC-2179 )

More information about Loop: http://www.prepaid-wiki.de/index.php/O2_LOOP

I would really suggest a rename from Jolla Oy as LOOP is just confusing. Call it o2 or O2 or _maybe_ o2 Loop.

@V10lator

Yes, LOOP was/is the name for O2 prepaid SIM-Cards

The english page on wikipedia doesn't has this information, so quoting from the german wikipedia page Telefónica Deutschland Holding:

"Das Prepaid-Angebot von O2 wurde lange unter dem Namen O2 LOOP vermarktet. Ab Mai 2009 gab es jedoch nur noch den neu eingeführten Tarif O2 o als Prepaid-Angebot, die bisherigen LOOP-Tarife wurden Neukunden nicht länger angeboten. Seit August 2012 werden die beiden Tarife O2 Loop und O2 Loop Smart aktiv vermarktet und sowohl Neu- als auch Bestandskunden angeboten."

The issue with Jolla is that the APN is named LOOP and has the pinternet.interkom.de target by default, while it should only do that if the SIM is on prepaid, and not for the contract SIMs. We need to know if that information can be extracted from the SIM or is even read from there directly, or if Jolla just preloaded certain APNs into their phone and select them roughly by provider...