For Americans Going To Europe Or Overseas

snaimon · 28-06-2006, 03:21

Quote:

Originally Posted by DRNewcomb

When should I roam rather than buying a prepaid SIM?
"It is not a given that it is always cheaper to use a prepaid account, but it does not take many calls at $1.24+/min to make it cheaper. The formula, which I have developed (and humbly dubbed "Newcomb's Cypher"

is:
Break_even_minutes = Bare_SIM_price/(Roaming_rate - Prepaid_rate)

Subtract the cost of a typical prepaid call from the cost of the same call while roaming. Divide the result into the cost of the prepaid SIM, discounting it by the value of any included minutes. For some combinations of roaming and prepaid you will find that it only takes a few minutes of use to pay for the prepaid."

Let's put some realistic #s to it AND correct me if I am wrong:

Prices in Euros

Start pack cost 20 with 10 Euro credit so raw cost is 10 Euros

Roaming rate say German SIM roaming in FR 1.59 Euros from documentation I have for an OUTGOING call from a D1 SIM.

Rate on FR SIM to FR .55 Euros

Therefore:

Break even minutes = 10 (bare SIM) / (1.59 - .55)
= 10 / 1.04
= 9 minutes

I take it the same can be done for INCOMING minutes

= 10 / (.79 - 0) (D1 inbound rate / minute is .79 Euros)
= ~ 13

So, in this case, if you think you will make or receive any more than 9 - 13 minutes of roaming calls while in FR with your German SIM, you would according to Newcomb's Cypher probably be better off buying the FR SIM.

BTW, the D1 highest roaming rate in in Zone 5, Egypt, Bulgaria, Thailand, Malta, Hong Kong, and a few others at 3.49. With that kind of outbound rate, the break even will be around 3 minutes in the above example.

Pat Bendtsen · **Please do the sums for me -** 25-02-2010, 23:38

I'd like to use an Orange Sim, but am using [...] pre-dial service to reduce my phone calls. The price that is charged from the UK to any other country is 3p/min without any connection charge (something that is often ignored in calculations) and without paying a topup fee.

How much is the roaming rate when using a UK Orange sim, but with the reduced rate service of [...]?

	(#2)
Pat Bendtsen (Offline) Junior Member Newbie Posts: 2 Join Date: 25 Feb 2010 Country:	Please do the sums for me - 25-02-2010, 23:38 I'd like to use an Orange Sim, but am using [...] pre-dial service to reduce my phone calls. The price that is charged from the UK to any other country is 3p/min without any connection charge (something that is often ignored in calculations) and without paying a topup fee. How much is the roaming rate when using a UK Orange sim, but with the reduced rate service of [...]? Last edited by andy; 26-02-2010 at 01:41.. Reason: spam removed